mate, if you really want to do it, dont listen to all these people that say dont waste ya time and blah blah, just do it. Try do most if not all the work yourself with research put some decent cams in her and just enjoy it, its gunna make more power than it dose now so either way its goin to be a bonus, it wont be as much as a turbo car for the money but its still gunna be somthing diffrent and new to drive till you get off your [p] and at least you can say you did it.
I did it with my first car, r31 rb30e, started out with 84rwkw in a gluged up dirty old 225klm head. Pull it off cleaned up all the ports with a die grinder, put all new seals though it, droped a decent sized custom cam in it from Cam Tech in sydney, made 104rwkw when i was finshed on bp98. was super fun to drive and sounded awesome.... all in all cost me about 2k all up, with the exhaust system, but i did everything myself..... cops couldnt tell a thing, it was just a fast enough car for a P plater and i had a sick time with it.