Well, since the 8 3/4" didnt debut in the A body until 1965, your unit would certainly be a replacement for that car! With that aside, any A body 8 3/4" rear will fit directly under any A body, any body style! There is a difference in the 1970 and later housing whereas the distribution block for the wheel cylinder lines was moved from right at the hump to further down on the drivers side axle tube, but other than that no other changes were made! What this block move will do is change the rubber flex hose requirements to put a 70 and later housing into an earlier car, as the body mount for the hard line to flex line union in a slightly different location! Other than that, they bolt right in!