Just go
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7mgte or
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----->$1JZ$ Or
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------->$$2JZ$$. Then again it depends on the power your looking of making. Do you just want a little more to get you around town, or do you want to create a formadable race car/street car? If you want a high performance car an n/a supra is not the way to go unless your willing to throw down alot of $$ to bore it out and get higher lift cams, race pistons, crank, lighter flywheel, clutch, MHG, Shortshifter, Nitrous, and so on. Fast N/A is possible just not very likely without alot of $$. Dont get me wrong throwing in a turbo/7mgte/1jz is also expensive. But you $$:Power is better.