Anything is possible, but it would be cheaper to buy a Ferrari.
Nothing will fit, not the engine, not the transmission, not the driveline, you'd have to replace everything right down to the wheels - which would then not fit in the wheel wells.
You'd basically have to replace the entire car, except for the interior and maybe the doors.
YES.
Yes.
yes, the dohc sl will fit. sohc 3000gt uses a distributer
Yes, you can but will involve some cutting.
Yes, a 1994 3000GT VR4 twin-turbo engine can fit into a 1995 3000GT SL with some modifications. Both vehicles share the same platform, but you will need to address differences in the wiring harness, ECU, and exhaust systems. Additionally, you'll need to ensure that the SL's transmission and drivetrain can handle the increased power from the VR4 engine. Proper installation and tuning are essential for optimal performance.
No other motor will fit easily.
yes
Yes.
is it 22''
yes it will
the 1991 3000gt are dohc. it comes stock with 222hp. they also made sohc but that wasn't until later generations of the 3000gt's. The 1991 dodge stealths came in sohc, compared to the 91 3000gt's dohc. either way, with minor adjustments, it will fit from sohc to dohc.
all the 3000gt DOHC 3.0 V6's are pretty much identical as far as i know, at least to 95. with respect to the differences to the turbo and non-turbo models.