distributer cap mods?

Ok....So it sounds like we got your attention.
Before you go tearing your manifold off,let's make sure that you have a leak.
1. Take your vacuum advance off. Plug all ports on the carb.
2. Warm car up,and set your initial to 12btdc (just for testing).
3.What is the car doing ? Is it idling good at this point ? Does it sound erratic ?
4. Take some WD,brake cleaner,carb cleaner,an spray quick squirts around the manifold,also spray it around the carb/spacer if you have one.Does the motor speed up. If it does,you have a vacuum leak,and we will proceed from there.Start here,and report back to us with your findings.