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Hi. I have a rebuilt 383 w/ a mild cam, stock 4 bbl intake and a 650 edelbrock carb w/electric choke.

Is that a 600 edelbrock or a 750?Dont think they have a 650.If it is a 750 throw that POS in the trash.600 will work fine same with an 800.This is not an edelbrock bashing,I have used 600 and 800's with great results.I had a 750 on a hot 360 had every problem you've described and then some.Started doing some reasearch and come to find out these carbs are CRAP.I would borrow another carb if you can and see if your problem goes away.If not fuel system somewhere