well you need to decide which cams to buy first. there are two types for two different goals
N/A cams are designed to scavenge, IE the exhaust helps suck in more air. this is what you DONT want on a forced induction setup, as alot of boost will escape during the overlap. then again, if you get blower cams now, you will probably be slower than with stock cams, due to the cams being designed to run with a blower for power, and no blower=no power. you might want to buy the n/a grinds now, and then when the blower comes, get the F/I Grinds and sell the n/a grinds off and take a bit of a loss. hell, you might find you dont want a blower and stick n/a+nitrous. my goals were actually a modular forged 5.0 with built heads and nitrous, 350ish hp n/a and 500+ with the juice.
you say in your post youre looking to purchase PI heads and cams? you already have PI heads/cams, they come on 99-04 GT's stock. unless you mean youre getting a set and sending them off to Patriot Perf.
id say the StageII head/cam combo will be awesome to pep up the 2v. i was actually looking into VT Heads/Cam combo's before my move to a 03/04 cobra. havent heard anything bad about either company.