383 exhaust manifolds

After some researching, I found that the LH 3751068 is a HP 73-4 B Body maniflold. The RH 3751074 though is a LP E Body manifold. I'm thinking that since I have to pull the LP 3751074 off anyway, I might as go with a better match. The RH 3751071, which I believe is the match, is a 73-4 B Body HP manifold. Anyone have one laying around? Rog