I got a 1969 Firebird with a 400ci motor. When I picked it up earlier this year, the previous owner told me that the engine was completely rebuilt and has a mild cam installed, Edelbrock spread bore intake, along with HEI distributor. I purchased headers for it which I plan on installing soon as well.
The carb is a Holley and I was able to narrow the cfm down by the # stamped on it which is 8879. Looks like its a Holley 650cfm, model 4175 w/ vacuum secondaries. I am pretty good at tuning Holleys so I would like to stay with them.
My question is, with the setup I have, can I get away with running a Holley 750cfm? Do you guys recommend another Holley model or should I just rebuild the current one I have...
