Nice one Adam, you picked the best colour too. Mines is also Red.
As CB says, your figures will need a forged engine the stock internals are good for 320-350 at a push but even then youd want a FMIC as the CC is good for 300ish, then uprated fuel pump, ecu etc it gets crazy costly!
Get it to about 320 and see how you feel first as that is relatively cheap in comparison!
Oh, and the GT4OC has a plethora of information in every aspect of what you want to do to the car so I highly recommend it!