[72' Stang 351 H/O]

Most everyone here who's looked at my posts knows my engine and all that jaz. I want to deck it out it's got about 260 horsepower stock and about 300 pounds of tourqe. (351 C Q code for those of you who didn't know) I want to put everything on it the question is. What do I really need to make near 400 horsepower and about the same if not more tourqe? Am I annoying yet?