Sell your car and buy a turbo model, cheapest and quickest option usually. There are many small and big aspects that add to a complete Turbo built MR2.
K6 & more so V6 conversions are all the trend for many reasons.
Many differences of turbo to n/a such as clutch peddle design and so much more, usually missed, that adds to the turbo engineering balance.
Depending on your goals, wallet and how long you will accept your car off the road doing a transplant is what path you choose. Buy a smashed mr2, race only imported mr2, or a turbo mr2 with lots of issues, and transplant/rebuild into your car - long time, lots of money of hidden rebuild costs for reliability (fuel pump, service items etc). Buy a Turbo / rebuilt / converted MR2 and drive happy doing little mods along the way. Each of us have our own path, some in hindsight maybe different.