Looking to boost the power of my 318

Well, I ended up picking up a magnum 5.2 for a good deal from a friend. It is fresh, but I'm going to freshen it up again to make sure gasket wise and such. It's 100% stock, but I plan for a crosswind intake and my 4 barrel, and possibly a cam later. It also has the rear facing magnum exhaust manifolds (flow much better than my early-a 273 manifolds) anyone know if they will fit on my car with this motor?