i think if you're going to do anything with cams, and you dont plan on upgrading valve springs and retainers and shit then go ITR or CTR but if u gonna upgrade big then GO BIG......i cant stand using parts that EVERYBODY uses, but thats me personally, and i see what you're asking and why you are asking it. i have not personally used blox cams but i did have a blox intake manifold and i never had a problem with it at all.....good luck