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it would be better to start with an alltrac, since its already awd. your major issues would be motor mounts, frame support, and a lot of custom work to the front supports, as well as the firewall, as the engine is mounted differently from the stock 5sfe. And that isn't even looking at the wiring that would be needed to be done to connect the other componts. As well as the suspension would have to be completely redone, as the extra weight of the motor would be a huge issue. Let alone the power that motor produces would rip the car apart, if it wasn't re-inforced properly.
The 3sgte is the better choice it came stock in the alltrac, can be imported, it came in 3 different gens 1st, 2nd, and 3rd. It's a direct drop in into you existing celica, if you get the one out of an alltrac. They range in hp from 170 to 245, and thats in stock trim.
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