Hi all, I have a 55 caddy 331 in for a customer. It was smoking bad and wouldn’t rev but sits happily at idle once warm. The motor was bad with a busted oil ring on #1 pot. Pulled it, fixed it and put it back. Carby ( carter 4bbl) was rebuilt. Hooked it all back up. No smoke now but still has same issue with not revving. If you tickle the throttle it will eventually get the revs up but surges real bad. Any ideas? My personal opinion is that the carb is no good.