Since I keep seeing Fieros that have been converted to front engine, what would happen if you went the other way?
Suppose you started with a 2003 Trans Am and moved the engine and transmission to the rear? Parts could be cannibalized from a Fiero or fabricated for the cradle, front tub, and various mounting. The Firebird would have to be cut in half, the rear seats removed, a firewall added, various fluid lines run, the gas tank changed to the center tunnel, and the trunk would have to be added. I'm simplifying, but this would surely be easier than swapping the Firebird interior and a 350 V8 into a Fiero.
For extra fun, when going in for the inspection, you could mount a wheel with a hampster next to a coil with electrodes that would energize the hampster, and have a little shaft from the wheel that ran to back toward the cab.