I would start with the basics and make sure the floats are set correctly as well as the primary blades set correctly. i would think stock jetting should be close.
Do understand a double pumper loves to dump fuel when opening the secondaries.
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1979 Firebird Trans Am 301/4spd (Now 428)
1977 Firebird Formula 400/Auto
2007 Grand Prix GXP 5.3L
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