B18C1 sleeved to 84mm
Eagle Rods (no point on spending double on crowers)
endyn pistons
Gsr tranny w/ quaiffe LSD
at least 660cc injectors
high flow fuel pump

a t3/t4e with a 60-1 and a stage 5 wheel in a .63a/r housing will be good to at least 450whp, over 500whp with an .82 a/r. but if your looking to make some serious power go with a garrett ballistic ball bearing/or precision turbo.