I have done this swap.
I went with a obd1 Aristo motor and used a U.S. tt auto tranny. Had to swap oil pans from the '98 vvti engine and drill out for oil feed.
I bought a brand new '98 tt harness and used a '95 obd1 ecu. This made the swap plug and play. I used a '95 tt rear end, driveline and axles. Used the '98 n/a fuse box, only 1 wire had to be spliced.
I'm pretty sure I could throw in a obd2 ecu from a '96-'98 and would then be able to pass smog.
I went with a single turbo during the swap. Precision 6262 billet with .58 hot side. It is perfect for auto. Made 378 rwhp at 14 psi on stock ecu and pump gas.
If you go non vvti you just need to pick up tt throttle cable, don't have to deal with gas pedal at all.
Had to do the 12v mod on fuel ecu. I used a tt fuel pump.
Only thing I haven't figured out is the cruise control. I will tackle that down the road. Will need to retro fit pre-obd2 cruise control somehow.
If I did it again I would find a vvti engine set and just get the n/a harness merged to run the turbo engine. Would probably be easier to get cruise to work but might have to go standalone, not sure on this.
If you go single this swap will be expensive, I've spent 10k easy on parts, some new some used and I did all the labor. No check engine lights and car runs great. I built it for my wife and she loves the extra 200 hp over N/A.
If you have any more questions hit me up. John