[doubleClutch]

Hey, thanks again for all the replies. The mechanic working on my car was very familiar with classics and Chevy's, but I don't think he did any of these adjustments correctly because once he got the car starting he decided it was running fine. Anyway, they are 6x heads, and I am not sure what the compression is due to the fact the bottom end is foreign to me. I am guessing 8:1.
How do I know how much damage has been done to the engine? The car still starts, and drives, but it stalls in idle sometimes, and stalls in reverse a lot without a long warm up. I am on a small budget, and have about $1000 to spend to fix these problems, but I need to know if I should spend it on tuning, timing adjusting, readjusting the valve train, or are all of them of equal importance. Here is what I was going to fix in order for the advice in the posts:
Checking if push rod slots were elongated, and elongating them if needed.
Readjusting the valve train
Readjust the timing for the new cam going to try initial timing @ 12-14 degrees (vacuum detached from dist.and plugged) w/ the other 20-24 degrees in the distributor first
Also, someone said something about the carb, will this carb be ok properly tuned?

Sorry again if these questions seem extremely basic, this is my first attempt at building a Pontiac motor.