For Ford 289/302 competition engines using modified stock cast iron or aftermarket Windsor-style cylinder heads such as Edelbrock heads #60259 and #77169 or equivalent. Victor Jr. #2921 has bosses for rear water crossover. Port exit size at cylinder head is 1.08" x 1.90" with enough extra material to open it up to 1.18" x 2.10". CARB RECOMMENDATIONS: Use appropriate racing Carburetor. INSTALLATION NOTE: Recommended intake gasket: Edelbrock #7220 or Fel-Pro #1250. Manifold height: A-5.50", B-5.50".