I will make one comment. I have a set of the hogged out RARE d-port manifolds on my 1976 455 4 speed Trans Am. They fit great and perform as well. They only problem I had was my LH manifold is of the 3-stud/flange and my clutch countershaft rests up against it. Also, on the same manifold, the outer stud was resting against the boxed area of the lower control arm. With a clutch adjustment and a little minor grinding, they fit perfect. No complaints here, just make sure you do get the 2 bolt flange for the 2nd gen F-body.
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