Sorta agree with both the previous posts..
enjoy what you have, build a motor that can handle power and then throw it all in..
or get a GT30 or GT35, bigger injectors, front facing plenum, wastegate, fuel pump, new clutch.. there is a few more thing you would need.. and then build your new engine while you kill the one you have ATM..
The last option is what i did.. Had a GT35 had 466hp, thrashed it to much timing went out and it was all over.. lol.. got more power out of it.. but it was best on the 466hp..