Need Head Help?

depending on what cam grind you have. its probably port time. i strongly recommend intake port matching to optimize the port job. the swirl port heads you speak of are great street heads but lack in most qualitys as a race head. on a 273 or 318 with port work int/head they do great. but they are far too anorexic for 360's .they make nice comp. great quench but not enough flow.