To be clear, all dual port manifolds for the Ford FE engines are not currently in production. As you may know, the 6060-DP and the 6061-DP manifolds are for the Cobra Jet heads. The manifolds may be used on non-Cobra Jet heads, but require modification to work. Also, the 6061-DP manifold will work only with Carter, Holley, and Rochester spread bore carburetor (Factory Motorcraft spread bore carburetors can not be used on the 6061-DP).