karlos you will need to figure out how much air the engine will need to consume at a given psi on the turbo your using to reach your intended bhp figure then see whether or not you need anything doing to the head to make sure it can flow the amount of air. personally i'd of thought the metering head is going to max out before the standard head or cam will in you pursuit of power, your going to need fifth injector or some other efi conversion too with what your planning, if it was me i'd efi it now and see what power you can ring out of your standards with around 20 psi through your stage 2 then you will know whether just to change cam or head or both and everything you do now will be able to be used when the steel bottom end comes along