1957-1995 SMALL BLOCK CHEVY 283 327 350 383 Manifold
Aluminum Dual Plane Qualifier Intake Manifold (Black)
Range: 1500-6500 RPM
Manifold Height: 4.65"

For street applications use 600-700 CFM vacuum secondary carbs. 
For high performance street, use 700- 800 CFM double pumper carburetors. 
This manifold produces power comparable to some single plane manifolds yet retains the throttle response and drive ability typical of a dual plane.