[SD455DJ]

Stuart is right...the '71-up B-bodies had a chassis redesign that moved the power steering box further ahead of the engine crossmember ala' A and 2nd gen F-body chassis layouts. The '70 and earlier had their steering boxes behind the front engine crossmember similar to the 1st gen F-bodies both employing the long branch exhaust manifolds. Without a doubt the A & 2nd gen F-body Ram Air exhaust manifolds will fit the '71-up B-body chassis, however, it looks like there may room for the long branch manifolds (maybe without the need for grinding?) as the engine sits further back on the crossmember than the A & 2nd gen F-bodies. It certainly would be beneficial to borrow a pair of each to trial fit to confirm.

The 3 non-labeled pics are of a '68 Catalina 428HO with the long branch manifolds and the rear-ward power steering box from the crossmember. The later Ram Air exhaust manifolds will not fit on the driver-side of '70 & earlier B & F-bodies as the steering box is occupying the same space as the rear dumps of the manifold.

Dennis