Accepts Either OEM 4-bbl or 4150-Style Square-Bore Carburetors. Will not fit under hood of Corvette without hood modifications. Will not fit "tall block" V8's. Will fit 1965-90 oval port heads. Edelbrock's Patented Dual-plane low-rise design with a 180-degree firing order greatly improves torque over a wide rpm range for excellent throttle response from off-idle through 5500rpm.