Joe - the Q-Jet used on the Pontiac was a 750 CFM; HOWEVER, the Q-Jet is a spread-bore design with only 150 on the primary side. And the Pontiac OHC 250 had a much higher VE than the stovebolt 235, and a higher RPM limit.
Jon.
Good carburetion is fuelish hot air The most expensive carburetor is the wrong one you attempt to modify. If you truly believe "one size fits all," try walking a mile in your spouse's shoes! The Carburetor Shop
