Do a few google searches for mr2 conversion, have a chat with qld club members at a meet up. Membership to qld club and the events allows you to gain all your info needs and more.
Mechanics who have tried have generally failed as its not a common job; wiring issues (ECU) and other issues that need more than I can bolt in an engine qualification. Blow out in quoted costs over $10k and ended up with a tired 3sgte gen 2 and oil leaks. Any mechanic who claims to do it recommend you speak to the owners of the mr2s they have done it for. Terry from road and track has closed up, he had the experience / knowledge but again would be much higher than just buying a turbo car.
Swap to a 3sgte gen 4 caldina would be best option, if you have the funds for a wrecked caldina (4,500-6,500) plus mechanical charges, plus conversion parts costs, plus gearbox / hubs / driveshafts, plus ECU/wiring - spend big $$,$$$z
Converting to a gen 2 or 3 3sgte is best for a rebuild before installing. Do it yourself as a project but you need good $,$$$z on top of major components; engine, gearbox, drive shafts, hubs, ECU, wiring loom, brakes (system).
Only person I would trust to take on a conversion is ex-qld mr2 club president (if he would take on the job).
Sell your n/a and buy a turbo car, there are many differences in the cars more than just engines, example differnet brakes, brake bias system, brake peddle and other vehicle aspects like gearbox, drive shafts, hubs and much more (you really need an entire turbo car).
Unfortunately we don't live in the UK or USA, where far more is possible at a reasonable price.
post edited by TonyMR2 - 2016/09/21 06:45:53