you need to keep your questions to one thread though.
it would be difficult, and costly i think. to keep the efficiency and benefits of the engine you would need to use the whole thing, pcm, wiring fuel system, etc.... the manifold is pointing the wrong way. all this adds cost to conversion over an engine that is already designed to be rwd. no factory turbos but you would have to buy hptuners to make the engine run without emissions and security stuff so you could put a aftermarket setup on and tune it with hpt. so really depends how much trouble and money is it worth to you to use it.
what are you building and what do you want to do with it?
1998 Bonneville SSE
2007 Monte Carlo LT-KYB, Clarion, Polk audio, Kicker
1999 Yukon SLE-KYB, Air lift, Reese dual-cam, Tekonsha
1987 Firebird-355/th400-nothing stock