Join Date: Mar 2002
Location: Austin, TX, USA
Any of the three would probably work. I like to avoid 750cfm square-bore carbs on a 350 motor. 750 is pushing the limit on flow and often will cause you bogging problems and other tunability issues. A 600 cfm carb is a good carb for a 350SB. Anyone who runs the 1/4 mile will tell you a 600 cfm is too small. I'm a street guy and like the dribability of a 600 cfm carb - and it still performs well. The Q-jet has the benefit of being a spread bore carb. It has smaller primary venturies which will make it run good on the street. And when you open it up, the secondaries can supply way more than air than the motor can use. It is the best of both worlds in my opinion. So I'd use the 600cfm holley or the Q-jet. Is your intake a spread bore or square bore design?
68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI