AVS 2 CFM???

It seems they jump from 650 to 800 CFM. I am under the impression that a good 340 should have a 750 CFM carb.
I'm thinking of getting the Edelbrock but need a nudge as to which one. The build should go like this so far .
67 Barracuda. Dont really know the weight but yarding the back seat is a lot of weight.
30 over 340 10.5:1 ish.
273 rockers
171 promaxx heads 65 cc.
270 duration 465 lift. Thats whats in it now. Still waiting for the heads.
Dougs headers.
3.91 gears and tall tires... 28 inch??? If I can. Mini tubbed with frame connectors.
Stock converter so far but would like to increase the stall some day.
Dual plane stock 340 intake but the Mopar aluminum version.
Recurved stock electronic distributor.
904 probably but I do have a 727.
Just a street car but I would like to race someday when I can afford it. 1/8 mile track about 3 hours away. Lost Creek race track in Anaconda MT. Probable have to trailer it for that.
Any way... I did one of those CFM calculators but they seem more of a stock configuration.