If it has something like .068-.073 idle air bleeds drill them out to .075 and see if that helps. I have never had to drill the plates on a carb if the IAB was correct. The timing should be 12-20 initial and 32-38 total. More initial with bigger cam/more overlap. Open chamber OEM style heads seem to like more towards 38 total where the more efficient engines I have worked on like 32-34 total.
IABs are currently .070. I will drill them or pick up some 75s.
Currently I ramp up to 28deg by 900rpm. G3 Hemi's are supposedly very efficient and don't need a lot of timing.
