Have no idea on manifolds???

Ok so, car is 1974 Dart Swinger 360 power steering that I put the headman block hugger headers on and I just am not happy with them, I think I may switch to manifolds. I know the 340 manifolds are the ones people want, but for the price of them I can get a set of headers that would work better then what I have. So question is, what manifolds are the best to use that cost less then the 340 manifolds? I know I need a manifold that dumps into the back for the passenger side and the driver side needs to dump in the middle, I have a set of 318 manifolds from the original motor. Or I was looking at building a set from a V8 magnum Durango and a early 80's dodge ram...