old bob

just got hold of some ported and polished heads off a STi2, were running 380bhp on previous car, im planning on using them in my94 wrx when i rebuild the ej20 closed deck where im hoping on 400bhp or maybe just over, will the heads be fine in themselves or will they need cams double valve springs etc, also wot sort of rpm are these heads capable of?

thanks in advance

darren