Idle problem

idrift said
12 initial might not be enough for that cam. Try bumping it up to 16-18 before,
that will bring the idle up and allow you to close the primaries some to bring
down the idle speed and then your idle mixture screws should work again.

Make sure to limit your total so you do not go over 36 before total on your
timing. You will probably find your vacuum increasing with more initial, if not,
eventually you may have to change out the power valve. If so PM me I have
a few new ones you can have.

Exactly. More initial will allow you to need less throttle opening to idle, then your idle mixture screws should be more effective. BTW, when you say "shaking", you don't mean that you're developing a "miss" on certain cylinders, do you?........because since you mentioned that this has happened with 2 different carbs, it sounds a bit strange. Better check that out.......if you've got a lean condition, the spark may be "jumping out" somewhere before it gets to the plug.