Carb flow rate?

[AnlaufJohn]

My 1966 C-10 has the original 283 V-8 with 2 bbl Rochester 2G carburetor.

I picked up a spare 283 long block and SM-420 tranny a couple weeks ago, and am tearing the engine down to have it checked for cracks and such. If it's good, then the heads will get new seats and then will be set aside.

My question is this: will the 2G carb flow enough to support my ideal rebuild of a 300 hp engine? I have used the calculators at several sites and my guess is I will be needing 420 cfm, give or take 20 cfm.

Where does a stock 2G Rochester fall? Too little cfm or just enough? I don't know if it has enough to reach the 5000 rpm limit I am looking to strive for.

Thanks in advance for this forum's collective wisdom.

AnlaufJohn