You should be able to get a T28 from a few places... if you just want a stock GTiR T28, try some of the places that sell GTiR engines like SOKO, SR20 Development, JGY, etc. If you want a custom built one, try HKS. For the injectors, try JWT.
go on the sr20 boards and send andreas mikro a email...he doesnt get pm's too often but he checks his email alot. You could also try Luis Anaya over there too.