72' 340 Drivers side HP manifold vs older HP manifold

Are they worth getting, just to have, No. Are they worth getting because you want or need them and are going to use them, Yes. will they perform as well as headers, No. How much of a difference-headers vs manifold, you can feel it, but actual Hp & Tq numbers I don't know-enough that I couldn't bother to look it up. New Manifold vs old manifold, I can't imagine enough of a difference to make it worthwhile BUT maybe I'm wrong. If one was going for a correct looking restoration or looking to race in F.A.S.T. it might be worth looking into.
I once thought I was wrong, but, I was mistaken.