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The engine is just rebuilt with 440 source heads and a 500 inch stroker kit it has a cast iron intake that does not seem to leak but with a smoke test there was smoke coming out of the base plates and throttle shaft



are they old carbs? Maybe they've been "cranked on" too many times. Try and re-snug them but not too much. And if your shaft is leaking I'm guessing that carb will need to come off. Unhook the outboards, start the car run the idle up to 1200, then back it down slowly say 1000 and adjust for best vaccuum. What is your initial and total advance? I'd think 36* total at 2200rpm and 18* initial would be a good place to start.