1st let me say that I am not being negative or bashing. I love the work you are doing as well as your balls and skill. You commented that the ecu was fine when new but better ones are out there now. Agreed. The engine is also outdated. The are V6s out now, 2gr, that make more power and probably as much torque. Why go the 1uz route? Its big heavy and doesnt make that much power by todays standards. Keep in mind that I want to bud a 4agte instead of going more modern.
Beauty is in the eyes of the beholder, you'll may see the 1st gen UZ outdated,
old, big, under power.
but.. what I see is the following ,4.0L( no replacement for displacement) all alloy, forged crank, boost friendly, non vvt, not to big. and its the engine the MR2 is been thirsty for, once the UZ is tune whit the GM ECU, will see if the 2GR is better.