GMC - Zenith carb.
Chevrolet - Carter carb. up to 1950 then Rochester after.
Consider required fuel pressure and flow.
Funny thing is Carter made the M751 replacement pump to work on Chevy and GMC.
That doesn't mean the AC pumps are the same though.


"Adding CFM to a truck will only help at engine speeds you don't want to use."
"I found there was nothing to gain beyond 400 CFM."