No, the NA motor doesn't NEED to be rebuilt to handle a turbo.
Make sure you keep the air/fuel ratio at a stoichiometric(pardon the spelling) level.
And I'm going to drop a 2jz motor into a Supra, as soon as I find the appropriate car. From what I can tell, ECU and everything else aside, all it requires to physically get the motor under the hood is a new set of motor mounts.
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