I have a '59 Dodge Coronet with a transplanted '77 400. It has a Holley 4bbl... 600-650, I'm not sure. I don't have the carb# at the moment.

Whether I take off hard or slowly the carb hesitates, stubbles and "sneezes".... I say sneezes because it really doesn't do the usual backfire. It sounds pretty much like a sneeze.

I have adjusted the air mix, ignition timing, tried to make sure there are no vacuum leaks.
It had a 31 squirter that I replaced with a 37 but that doesn't seem to matter in the least.

Any suggestions?