I'm sure with a little thought you could easily use the above kits,there is not much room in mr2 engine bay either,pace used to do a kit but i think rogue have a better kit now,give them a shout i bet it wouldn't be much more expensive than a decent air to air intercooler.
Cams may
help it's a bit hit and miss,you may gain 20/30 bhp but i wouldn't have a clue what actually works well in a 1.8t,i think it's a bit of a missed area in 1.8t tuning.