I'm thinking of replacing my factory quadra-jet carburetor. While I don't understand the little differences between my carburetor and one that came on V8, I do know that all quadra-jets of this time were 750 cfm. This seems like a ton of cfm for my 250ci engine.

I'm wanting a Holley carb (just because). Holley's initial suggested replacement is their 0-8007 390 cfm square bore carburetor. Their 0-80555c 650 cfm spread bore carburetor is a quadra-jet replacement. Which of these or any other is a good replacement?

I'd like to go with a square bore. Maybe I could use it on a future V8, but not the dinky 390 cfm one. Doing so will require an adaptor. Simple enough but this raises the carburetor ¾"-1". Would this create any issues with linkage or hood clearance?

Any thoughts y'all have on replacing a Sprint carburetor will be appreciated.