I would suggest starting with verifying firing order, TDC, and timing. Also check to ensure there are no vacuum leaks, and check the carb base gasket, plate if it's there too.
Try to find out what cam you have too, only lift doesn't give enough info.
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1970 GTO Judge Tribute Pro-Tour Project 535 IA2
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1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car
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