Can I use B or C body manifolds fore better flow on my sleeper GTS?

Nicks garage (on you tube) did a manifold/header test on a 440, of factory hipo 440 manifold, maxwedge manifolds, and headers. Headers won, obviously, the max manifolds did very well, the normal 68-70 magnum manifolds, not so much.
I don't remember the numbers, anyone curious will have to look it up. But as said above, the more power/displacement you have, the more power the manifolds hurt.