The Holley 7448 350 CFM 2 barrel we were required to run at the Nashville Fairgrounds 5/8 mile oval would let a Chevy 350 run slightly above 6K RPM, so the carb will flow a lot more than its rated CFM- - - -it just won't do it at the specified manifold pressure where the flow is rated. Jon's suggestion of the low-CFM Carter 4 barrel is probably a much better idea. Holley carbs in general are a "one size fits none" situation without a bunch of custom tuning.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!