Stu is spot on but a clutch will be needed, Mark is a little over the top as changing the cam and breather setup isn't necessary (although cleaning the stock system out is a good idea and this is assuming your cam is in good condition too).
Plugs can also be NGK BCR8ES.
Basically the stock internal as will take around 240bhp if in good condition, but you'll not know that until you try or strip it down for inspection.

So minimum requirements:
Stage 2 T3 (.36/50)
-31 Actuator
FMIC
Clutch
Chipped ECU
Tune up!