Edelbrock part 7566 RPM Air - Gap 460 intake manifold is designed for street and high performance 429460 c.i.d. Ford V8's with standard or Cobra Jet heads. The RPM Air - Gap 460 incorporates the same race - winning design that's been used on our Victor Series competition intakes for decades. The Air - Gap design features an open air space that separates the runners from the hot engine oil resulting in a cooler, denser charge for more power. It also features a larger cross sectional area (3.3 square inches) than the Performer RPM 460 manifold 7166 intake manifold for even more power in high performance and large displacement engines. The carb mount flange accepts both square - bore and spread - bore carbs for Cobra Jet applications. Will not fit 1988 and later models. Note Early Cobra Jets came with Quadrajets.