The reason we where thinking 3TGTE and not 3SGTE as it's an older motor and in SA I think you can get it legal with aftermarket Turbo and computer. As with the 3SGTE you would have to run standard computer and the rest. The general turbo, pistons, intercooler and computer will be done as well as custom inlet and exhaust.
I guess the only way to go is a W55-8 gearbox and a custom commodore diff should do the trick for a quick all round street car.