Originally Posted by BigChevyFTW
if you use a simple math formula. it says to use a 500cfm carb for a street driving application and a "650 for all out racing" the 600 is more suited for a 350 daily drivin street application
considering most came with 500cfm 2 barrels that ran great. the 600 is a better choice for this set up IMO and most engine builders will agree.
and the cars that came with 750's had 4 speed manuals in them or were muscle cars with soild lifter cams
wrong, even my old factory 1987 camaro Z-28 with a 305 came with a 750cfm Q-jet from the factory. but like Silver Surfer mentioned they were a spreadbore design carb.
since you seem to be an eddy fan take a look here
Edelbrock 45411 - Edelbrock Performer 350 C.I.D. 9.0:1 Crate Engines - Overview - SummitRacing.com
that's a mild 320hp 350 with a 650cfm eddy carb
or how about this one
Edelbrock 46404 - Edelbrock Performer Hi-Torq 350 C.I.D. 9.0:1 Crate Engines - Overview - SummitRacing.com
that's still a mild built 360hp 350 with a 750cfm eddy carb (i think it would be fine with a 650 though)
Edelbrock 45924 - Edelbrock Performer RPM E-Tec 9.5:1 350 C.I.D. Crate Engines - Overview - SummitRacing.com
still a very streetable engine at 435hp 350 using a 800cfm eddy carb
now i dont agree with some of these carb sizes, but that is edelbrock for you, they are not ment for performance in my opinion. the OP said that he has a ZZ4 short block with mildly worked alm heads, and a GM hot cam which is pretty much the GM 350/350hp ZZ4 crate motor, and even GM Performance recomends either the 650CFM or the 670CFM carb for this motor.