I don't know about a bigger cam but maybe a better cam-maybe. Your engine is a pretty good example and your 1.33+ tq/ci is an indicator of how good your combo and those heads are--at least it stands out to me. If you came to me looking for more power but said you wanted to keep everything the same except cam I would tell you that I doubt I could really help you out much if at all. I'd probably tell you not to mess with it unless you had other issues to address. J.Rob