Not sure if i missed it but what turbo are you going to run, i would also think about speaking with Cal Hartline (tuner) and getting a FAST XFI from him to help manage what your car is doing. Also if you invest in a set of nice aluminum heads it would help in power since they will have a better intake and exhaust port resulting in more power. PTE has a nice Ball bearing 64/66 Turbo that will spool really nice for the street and will take you upto 900HP....
He is only looking for 600 hp .... why all those "kool guy" parts to do just that ??