And I am sure I will get lots of response to this, but the real issue is both of these carburetors are to big for their respective engines.
Especially the 600 CFM holley for the mild 302.
Consequently you have to compensate by reducing the amount of air flow at idle (reduced idle mixture screws) which then makes the carburetor extrememly sensitive to minute change, Most people then try to play with the jetting which does nothing for idle speed and idle airflows.
By changing the jetting especially drastically you then upset the balance of the carburetor causing problems elsewhere. Jetting should never be changed more than one or two setting for the street.
Try to borrow a smaller carb from someone and set it up and see how it works, I can almost guarantee you will be more satisified.
Bill White
White Automotive
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HAVE A NICE DAY!!!!