Hello
Was wondering if anyone could help me out , i want to buy holley's avenger carby for my SBC , but dont know which one to go for ? the 670cfm or the 770cfm ??. I'm looking for the best torque an Hp i can get . The car will be used for street/strip .

Engine details :

355ci
Bored to 30 thou , 10.1 hypereutectic pistons
Crank regrind to 10 thou
Comp Cams XE Xtreme Energy XE284H
Rollmaster timing kit
Engine components balanced
Brodix IK200 Heads ,Chamber Volume 70cc
Brodix HV 1016 intake dual plane manifold
Crane Gold Series roller rockers
HEI distributer with performance module
Turbo 350 gearbox
B&M torque converter 3000rpm
Transgo shift kit, stage 2
10 bolt, diff ratio 3:08
Hedman Headers 1' 5/8 with 3' collector
exhaust dual 2'

Thanks

I'm running:

- 350 Four Bolt Main
- Bored .030
- Comp Cam ( a couple steps above the cams that come in the 350hp crate motors)
- Comp Cam Double Roller Timing Chain
- Stock Vortec Heads 64cc W/Comp Cam Springs
- Edelbrock Performer RPM Intake
- Holley Street Avenger Carborator 670 cfm
- Polished Crank
- Federal Mogul 11.1 Compression Ratio pistons
- Speed Pro Chrome Moly Piston Rings
- Holley Electric Fuel Pump

The 670 seems to be just fine for my setup