Trailways/Greyhound may be cheaper but make the box out of 2 X 4, it's going to get kicked around. Terminal to terminal is cheapest if you're near one.
W/r/t turbo size: is the whole thing too big, or just the A/R?
I would guess 20 psi would make over 400 hp with an IC.
There's a lot of conversation on line about the cam, tower, fingers, etc. as to what fails and how to fix it that I don't understand but for boosted I would be most concerned with getting the best condition stock parts rather than $$$ to get more peak power.
What struck me as a false lead was discussion about porting, valve sizes etc. I have not seen any demo that predicts how a small head (Toyota 2JZ) can produce huge power when almost everything else isn't even close at the same boost level.
