Yes 465's were used with the one piece rear main motors, and they are interchangeable with the NV4500 flywheel IIRC. (should be, Vortec's were pretty much the same engine)
If it was a manual Camaro, then no issues with the PROM if the engine is transplanted into the truck. Key to keeping the swaps "simple" is to run all the stuff out of the car. If the engine thinks its in the car, it will run like it was in the car, and thats what you want.
I wouldn't say TPI is "way harder", it just has more things to it. Of course, the gains are exponential. /forums/images/graemlins/smile.gif Once you understand the system it's not real complex...lots of wires, but sit down with a wiring manual, and you'll see it's not THAT bad.