I put a SC 3.8 litre V6 front wheel drive out of a '98 Pontiac GTP into my '67 Volvo wagon. Turned the engine 90* to RWD and bolted on the bell housing, flywheel, clutch and T5 tranny out of a '96 Camaro. That was the easy part!! I used the ECM and wiring harness from the Pontiac along with a gauge cluster from a '99 Camaro. Took about two weeks of sitting, studying, clipping and soldering wires to sort it all out. Started up on the first try and ran great until I took it apart to paint.
You can see a photo of this in my photo album.