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Why 71-73?
My family had a '66 hardtop that I worked on in my early teens.  It was going to be mine to drive, but my brother got rear ended in his Chevelle, so he got the '66.  I guy down the block had a '69 Grandé which I bought at age 15 in '78 and owned for nine years.  Courted my wife while driving it.  Sold it in about '87.  Jump forward to a year ago.  My wife had always wanted to get me another Mustang.  Saw a '72 convertible listed on Craigslist in Sun City, AZ, in the garage sale category.  Went by to take a look.  Ended up buying it and now it is the fun car for desert cruising.  Reasons - It was a Mustang, it was affordable, it showed up.
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For me, having just got my 71 mustang, it was always a dream to one day own a genuine American classic muscle car. Quite a few to choose from of course. I'd narrowed it down to either a 69, 70 or 71 car (no later as power was sadly curtailed thereafter) which, despite being from the UK, still left some good choices however prices inevitably came into it. Seemed like most of the marques (Chevelle SS, Olds W32, Pontiac Judge, Buick GSX, Torino CJ etc) had basically very similar styling with variances to grill and rear bumper. Only the likes of the corvettes and the 71 mustangs looked kind of unique. The former (as well as the 69 and 70 mustangs) were out of my price range for a mostly original car so it seemed natural to then look closer at the 71's. OK they are bigger and heavier, though more powerful to compensate, and personally I really like the fastback styling and silhouette. Long, sleek and low yet powerful and graceful at the same time. Having come across a 429 CJ (rare for the UK) that was that :-)
First one I ever saw was bright orange 72 Mach and belonged to the brother of a friend.  Thought it was kind of strange looking with the flat back window and saw it as just another evolution of a popular car that didn't look like an improvement.

Decades went by and I still didn't really care for them, but ended up taking one with broken C6 in trade on a Corvette I had decided to sell.  At first I was just going to sell it also, but never got around to actually making much effort to do so.  Being I had the empty garage stall and the body appeared fairly well-preserved, it got the vacant Corvette garage stall.

It had an Atlanta Falcons window sticker on it, so it had been a southern car and the transmission issues had kept it off salted Minnesota roads until I got it.  As I had it sitting in my garage, I gradually began to appreciate it more visually, became aware of the mechanical improvements over earlier models and that it really wasn't all that much heavier than immediately preceding versions. And it had the 385 series-friendly engine compartment while I already had a professionally rebuilt 460 sitting on a stand that would bolt right in.  

Once that idea took hold, really had to convert it to a 4 speed.  Then it really needed Mach gauges, wiring and different rear axle to suit the replaced drivetrain. Subframe connectors to handle the extra power..  Of course, 429 coil springs and rebuild the steering and brakes... While all this transpired, it became clear that structurally, the car was really solid. Likely due to southern origins followed by years of inside storage since it came up north,

Couldn't just leave the perfectly good flat hood on it, so it got the scooped hood and eventually decided it really should have functional Ram Air, so now it does (along with sport mirrors, wing, chin spoiler, etc..). Now I think the body style looks tough, instead of odd.

So, for me it just kind of grew on me and it's gradually become part of the family, though many other cars have come and gone over the years.  The nephew I got it from wants to get it back now I recently heard, but I am no longer inclined to part with it. Hopefully won't need to for many years yet.
My dad had a 73 Mach 1 when I was a kid, which is the year I was born. And now own his 2nd 73 he bought around 1986. Starting a total tear down now and rebuild as a pro-touring style.
For me I had always preferred 69-70 Sportsroof/fastback Mustangs.  The 71-73 model years were considered to be too bloated looking, and were far heavier than prior year models.  I just did not take the 71-73 Mustangs seriously.  My loss.  On more recent years I began to appreciate them, then we acquired our 73 Mach 1 in Summer, 2018.  I have owned several 60 Mustang/Mach 1 vehicles, and we have a 1969 Shelby Gt500.  I know these 69-70 units inside and out.  It turns out there are a lot of similarities with the 71-73 model years and the 69-70 vehicles.  We love to drive the 73 Mach 1, a lot.  I feel badly at how I omitted the 71-73 units as worthy Mustangs for so many years.  My loss, and I am trying to make up for it now.
I had always assumed that the 71-73 Mustang was far heavier than earlier models, but the difference does not appear to be that much given that the 429-460 BB fits and torque provided far outweighs weight gain. These numbers are from ClassicMustang.com and do not specify engine size so likely these are all versions with small blocks, anyone have contradictory information?

1967 - 2,758 lbs
1968 - 2,758
1969 - 3,122
1970 - 3,122
1971 - 3,086
1972 - 3,086
1973 - 3,126 (presumably 40 added lbs. is mostly impact-resistant front bumper, so similar weight to 71-72 if using the earlier bumper)

So, if these published weights are roughly correct, the 71-73 does not appear any heavier than similarly-equipped sought after 69-70 models and only 3,086-2,758 = 328 lbs more than the much smaller 67-68 which chassis won't easily accept the 385 series engines that easily offsets that much added weight with additional torque.
My first car was a 73 Grandé, purchased in 1978 as a car to get around in when I was in college.  You never get over your first, and so it was an easy choice when I wanted to get a project car to work on the last few years.  To this day, I am guessing I'm one of the few that prefer the lines of the vert and coupe over the sports roof model.  I didn't have much of a perspective of earlier Mustangs when I bought the Grandé, except for the 68 Shelby which was epic and out of my price range.  I wanted a car that was lower miles and only 5 years old or less, so the 73 was the one.

I had the luxury of working in an auto shop at the time that I owned my Grandé, as I put myself through college, and so felt very comfortable working on this car having already done much of the work I was attempting, previously on the Grandé.  I really like that most of working on this car is nuts and bolts, and the rest can be figured out on this forum.  The Cleveland engine is pretty straight forward, and if I can work on it, anyone can.

- Scott
Because, like Lee said "They're a fat pig!". Actually it was price to buy my 71 ($1400) and my 73 ($1000). But have really come to like the big size and the uniqueness. This site also helps tremendously in liking them more!
I found this earlier thread about the same topic

“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
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