While I will participate in the poll, I am also passing on an observation. It sounds to me like you are somewhat happy with the current "setup" as it relates to the car. I think you would do well to make changes in relatively small increments.
Based on what I have learned/experienced over the last 38 years, this would be my order of "changes:"
1. The ABSOLUTE best performance upgrade you can make INITIALLY would be going to a set of long tube headers. Believe me, you will feel the difference in the seat of your pants. An added bonus is that change will compliment future changes.
2. The next "change" would be going to an aluminum 4V intake and a 4V carburetor. This decision will take some thought though as you do not want to get a carburetor that is going to be at odds with any future valve train changes. Based on your apparent plan to use the Comp 242 cam, I would suggest a carburetor around 650.
3. The next change would be to the rear end, specifically the ring and pinion gear. Based on the cam you are thinking about getting, I would go with a 3.25:1 or a 3.50:1 (if you don't already have it). You may also want to upgrade to a traction lock at the same time.
4. Next would be the camshaft and ignition changes. Sounds like you already have a "handle" on what you want to do in those areas.
Each of the above changes (if done in that order) can be done without any adverse impact on the driveability of your car.
After each change, i would drive the car for a while to get a "feel" for what I have gained (while keeping your fellow board members informed
Food for thought?