---this is a very braud question---

if u are goin to go all motor the put a c5 with a b16 final drive in the gsr tranny, and build the fuk out of the motor with high comp. if you are goin to go turbo i would take the b20 block with a b18c1 head with head work retainter and springs w/ the ls tranny for the gears,but you can go wither way just depends on what u are tying to get out of ur motor------you have a light ass car so which ever way u go from what ur sittin with now u are go to be happy........atleast for a litl bit