Cheapest way to make 300 crank hp from a 5.2 magnum

Rockerdude said
The manifolds I have are off this motor originally, they are from a 1996 Ram.

Measure the outlets on them. If they are 2.125, they are the good ones. Even if they are not, they are still much better than the original early A V8 mannyfolds. I would use them regardless.