I have adjust the idle mix a few times no change.The wires are new the plugs were new and i just clean them.the gap is .40...It does seem rich and i change the jets down to .60 the smallest ones i have in my set.
I just had a buddy down off a diff carb to test with just for the heck of it.But it is a 390cfm 4bbl.
I will try anything before i start pulling valve covers and intakes and timming covers to check everything else.