5.7 Hemi into an older Suburban?

That is probably a better idea. Which leads me to another question; where do I advertise to sell the drivetrain, and what is a reasonable price to ask for it?
(It had 200k miles, but was well maintained and was running strong with 0 problems).

I'd start with here and Craigslist, and not just your local CL either, as there are plenty of people that want Hemi's.
I can't help on worth, but I do know even a needs rebuilt running Hemi alone is worth a good chunk.
Then there's the "More money than sense" crowd as well. :D