I did the straight edge thing, and there ok. i rebuilt the carb, changed the base gasket a few times. what i see is a poor design on the intake manifold, the sides to the plenum are too thin, not a good mating surface. this has been an on goin problem for years, could never get it to idle right,allways running to rich. I do about 5 gallons to the mile(not a good thing).
Time to fix it right, so now im looking for a matched set(carb & intake).
Whats you opinion on the performer rpm air gap intake from edelbrock???
Thanks again and keep thhe input comming