i am just guessing but it sounds like a trans thing not a carb thing.....the variable that causes the problem is the shifting of your trans. i am not an auto trans guy but is it possible to have a vacuum leak in the trans system ? with that clunking i would be looking at your trans not the carbs...just tryin to help......
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1981 Trans Am project -YJ 400 stroked to 488 CID-74cc Eheads-10.95:1-Northwind Intake-Holley Terminator-TH400-3:55 Moser rear-Dougs Headers....
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