First question wasn't stupid, but we're in danger of sneaking up on one...
A body shop shouldn't be doing engine swaps. It's not a "relatively quick process" by any means.
I'd recommend doing some reading here:
300zx-n-a-to-fairlady-z-tt-swap-t185465.html
You're gonna need a LOT more than just an engine.
Keep in mind, after you buy a clean NA Z32, and then source a good VG30DETT, and all the needed parts, and pay to have the entire drivetrain swapped, you're going to exceed the cost of a clean TT - by FAR.
Patience and persistence will pay off.