Just for the sake of mod and parts availablility I would recommend at least the 2.0 liter. You can pull a solid 300-350 horse out of the 2.0 and if you decided it wasn't enough later on, you could grab a 2.5 L STi shortblock and bolt it on to the heads, exhaust, transmission, etc. without any headaches. If you insist on the 2.2, make sure you use one that was already meant for boost. You would be amazed at the differences between a turbo and a non-turbo block. The turbo block will usually have twice as much webbing cast into the block, and it'll be way thicker in stress prone areas. If it is and open deck block, find a competent machinist and see if you can entice them into building you a deck girdle at the very least. This will help keep the block from flexing too much, and help keep the cylinders from deflecting under heavy boost. You would also want to consider fabbing torque plates onto an open deck block. I have seen Toyota 22RE blocks with 8 inch splits in the block from over torquing at the motor mounts when running at around 15 psi of boost. The 22RTE has a ton more webbing in the block and the torque plate isn't necessary until the HP and Torque levels start getting pretty high. Plus, putting fuel injected turbo on a motor that was never available with it will be a chore in and of itself. You'll have to find someone that is capable of flashing the ECM and willing to put some substantial time into getting the computer parameters close enough for even your first test drive.

 

I think there's still a company in Seattle that imports Nissan Skyline RHD's. They're not illegal, but i think they do have to change the bumpers a bit because of different crash safety standards. Hope some of that was helpful.