If you feel the distributor is adjusted correctly and you said the carb is a rebuilt 2 Barrel. I would suggest adjusting the idle mixture screws on the carb. Try using the info at this link for the adjustment. http://www.gmcpauls.com/Tech%20Tips1.htm go to the page where it talks about vacuum gage use then read down to the part about idle mixture adjustment.
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66 Chevy C30 Stakebody Dump, PS,PB, 327cu in
71 Corvette Coupe 454 4 speed
69 Chevy C20 Custom Camper
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