Did you check the carb-to-manifold bolts? There may be a vacumm leak that only shows itself upon acceleration and is most notable when the carb is still cold in the "choke" mode. If those are loose or you have a leaky gasket you may have a lean out situation that is starving the engine for fuel like you described. Good luck.
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Dan
'77 Cutlass Supreme
'46 2 door
"The rocket 455.....it's a sledgehammer approach to a thumbtack world" LuxBlue of HAMB.
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