distributer cap mods?

pjc360 said
yes, and i assume this is to drop the idle down lower so i will be able to hear a change in idle when sparying wd-40 along the intake manifold and the base of the carburetor, correct?

I run my cars usually around 850-1000rpms. Depends on how radical a cam.

If lowering the rpm helps you find a manifold leak,that's fine.
There is a few ways to skin the cat here. Trial and error.