going from sohc to dohc? if its a dohc non-turbo you just need some parts from a turbo and swap with lower boost..
FOUND THIS
http://www.3sguide.com/3000gt-twin-t...-guide-how-to/
Manifolds
turbos
charge pipes
intercooler(s)
etc...
hit up 3si.org and look around *FOR THE LOVE OF GOD SEARCH BEFORE ASKING THERE*