Power loss on 235 motor

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My 1956 Chevy Belair 235 6 cylinder has a power loss and backfire with sharp acceleration. Slow acceleration when parked motor responds well. This also results in very poor drivability until vehicle is up to speed.

Compression is 100 across the board, timing is a few degrees BTC, newly rebuilt carb, completely rebuilt top end.

Anyone have any ideas??
Thanks in advance.

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Posted by shipf (Questions: 1, Answers: 3)
Asked on February 14, 2023 1:28 pm
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Private answer

Power piston in carburetor stuck or not getting vacuum due to intake port under carb being blocked.

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Posted by toddy (Questions: 0, Answers: 1)
Answered on February 16, 2023 3:14 pm
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That’s where I would start my troubleshooting.
(alan at February 20, 2023 3:08 pm)