Holley Idle mixture screws non responsive?

What is the timing set at right now?
I would 1st
set the idle mix screws so they are 3/4 to 1 turn out and even on both sides, then set the initial timing to 18* and lower the idle blade setting down and see how it idles after that, but watch the total timing you don't want to have more than 38* [or around]