Basic upgrade for 500-600whp:
Engine: Scat/Eagle Con rod, Wiseco Piston, ARP main Stud n Bearing.
Head: ARP head stud, metal gasket, high cam kit, adjustable cam pulley. Mild port n polish job would help to achieve your target...
Force Induction: GT35r or anything above, exhaust manifold, upgrade Intercooler (evo 8 would do), boost controller and wastegate 38mm.
Fuel delivery: Walbro pump, AFPR, injector at least 1000cc.
Ignition: a good coil n plug cable... COP/Direct fire system would made it easier to achieve your target.
ECU: Microtech (the champion choice) or Haltech/Motec/Autronic/AEM..... just go for anything that run direct fire and sequential injection.
Twin clutch (QM the best) would help during your dyno n beating session.