I loved my +T setup in my 92 240, it would hook-up nicely from the lights but run out of puff higher up with an AW71L & the shitty manifold with a 12b
I put my drain line here:
Turbo computers, P80 T5 injectors (Whites), lengthen the MAF wiring & make sure your O2 sensor & MAF are functioning correctly & you'll have a fun car.
A wideband is a VERY good idea, I deleted my visco fan & went with an adapted 850 fan & 740 shroud.
If you kill the NA motor, you'll loose out on about $100 in gaskets & a day swapping engines over if you are capable on the tools.
I do miss just how potent the high comp motor was with a tiny 12b, 2.5k stall accumulator modded AW71L, Thelostartof chips & RE003s. It was a shitload of fun