400 hp? NOT A PROBLEM!!! Im a salesman for a chev dealership in canada. The 00 ta was rated at 335 hp, the vette at 350. Now, first, the only diff between the motors was the cam, and the Camaro/Transam actually had a wilder cam than the vette, if you put both cars on the dyno bone stock the vette HAD 350, the TA/ z28 actually put out closer to 375. FACTORY, the reason GM did this was so that they didnt make the 35000 dollar car look like a better buy than the 70000 vette. so the best way to hit 400 plus hp, is a chip, exhauset and a cold air kit. less than 700 bucks spent and Id garentee 400 and change. I also have a 150 shot of silly juice and its a BLAST! some old time old school rodders dont like it, but to each there own. Dont need a 150 shot, 75 will kick you in the pants good and hart also, I just dont mind rebuilding my engine from time to time, it gives me an exuse to put more stuff in it. 75 shouldnt hurt your motor in moderation. Buy the car, have fun, keep us updated, and if you have any hard mechanical questions, Analogkidd455 seems to me quite good and knows his shit. good luck.