most of the ford manifolds don't line up with the ports, because of the 2 bolts, there wouldn,t be enough meat for the bolt if they matched, the long bolts match up so the make more power, I also have a set of center riser fords, polished but need a little elbow grease to make them nice, they are $350.00, Give me a call if interested, I am not a typist, 1818-890-1867