1962 factory 318 poly Carter AFB four barrel, cfm?

[65 Cuda 340]

I'm running a 1962 318 power pack Carter AFB on my slant six. Runs well overall, although I think it is probably bigger than I need, and it does have a mild bog when the secondaries first open under full throttle in low gear (automatic, 2.94 gears).

Anyone know what the cfm rating on this carb is? To clarify, this carb was OEM on 1962 318 poly motors with the optional four barrel and dual exhaust, rated 260 horsepower.

Is it bigger than the Carter AFB's that were part of the hi-po 273 package?

 

[Darter6]

I believe they were in the 400-425 cfm.
I remember a Hot Rod article by Steve Magnante said they and the Buick AFB's of that time were the same cfm.
NICE ! Clean Slant.

 

[Brooks James]

273 HiPo 500 cfm