Only issue is with anything bigger than a 1.84 if your shifting over 6K your going to need springs...PERIOD. No ifs, ands, or buts about it...unless you want valve float. Get some 1.84:1 Roller Rockers...after your headers Dakota(h) lol can't remember how to spell it...anywho...let it breathe better before moving more air...after headers, rockers, CAI...you'll be ready for a 3.6 most likely.