the problem man, is that you said you dont want a big cam, 430-450 whp through a truck drivetrain is going to cost...i dk...20% drivetrain loss maybe, u will probably need at least 550hp at the flywheel to be safe, i mean thats another 200 flywheel horse over stock. so either you spray it or you have to get a big cam with some heads that will flow.( member also that you need heads and cam to match to eachothers strong points. you dont want to just go buy "a good cam" and "good heads")...what you do is personal preferance. cost effective than i would say nitrous, but just my personal opinion is that if you want that kind of power you are gonna need a big cam, heads to match, and that cam is going to require a fairly high stall. if you are highly against the big cam then a final option may be....smaller cam 224 -228 range, some nice heads,fast 90mm throttle body and intake,underdrive pulley, longtube headers and full exhaust, full air intake system......all that will get you probably between 380-410whp. honestly i really dont think you are going to reach your hp goals without spraying it or just getting a bigger cam with all the stuff that i mentioned. then agian you could always bolt on a supercharger or turbo.....cost effective id say #1 spray #2big cam with all those other parts #3 forced induction with full bolt ons....i dk i hope that helps man.