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Vacuum hose routing
I think the only one he has in that thread is just that one.

“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
What a great job of taking pictures as you go. David did a lot of work. Never fails though, the more pictures I see, the more I look, the more I want.
Can never have too many.
Got lost going through the thread and will now get back to focusing on the pics about the original question.....vacuum lines.
So looking at the 250 and 302 calibration schematics for 73 that I have access to, which is not many, there are similarities in those that specifically state with or without AC.
Specifically 3-8C, 3-9, 3-11C, and 3-11E, in that the main difference appears to be that when showing with AC, a 3 port water temperature actuated switch is introduced into the vacuum advance circuit to change from one vacuum source to another. Could one stretch this to the conclusion that if AC was added to a 351C calibration you would add the same type of circuit? Being the Clevelands have dry intakes, the choices for a water temp switch is limited. Helps explain why the 2 port switch for the EGR is in the heater hose.

Don't believe Ford wanted to spend too much time on this in 72-73. They were working on the next Better Idea......the Mustang II.

Probable that there really aren't any "magic diagrams" that show it all. In my opinion, calibration drawings are just that, they show Emission Calibrations and information. A "full-up" vacuum drawing would have AC lines, ram air, manifold vacuum trees, brake booster, choke, air cleaner, the double vacuum loops on the firewall, and so on. Too much data for one page I think. I would assume that other stuff would be in another section of a service manual. Perhaps there is something elsewhere that shows what happens when you add AC to a 351?? Perhaps in a Technical Service Bulletin?

Looking at this post 
which also appears to be an unmolested 351C with AC, you can see a 3 port switch in the water pump. In other pictures on the same page, it has been removed from the pump and is hanging next to the outside of the right valve cover.

No answers, just more questions.
[+] 1 user Likes kingb1973's post
If you want to research the TSBs you'll find a link in this thread.
Good luck.

“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
[+] 1 user Likes Don C's post
That is one heck of a lot "o" Data. Should keep me busy for some time to come. Great link if I can figure out all the online navigation.
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