During the time that I owned Fiero Addiction I did  many different engine swaps including 3.4 DOHC V6, 3800 Supercharged V6, Cadillac 4.9 PFI V8 and 4.6 Northstar V8, 350 and 383 Chevy V8, LS4 5.3 V8, and BMW V12 into stretched Fiero chassis. Here are just a few examples.

5.3 LS4 V8 swap for Bob’s 1988 Fiero GT.

Turbocharged 383 small block Chevy swap for Hugh’s 1988 Fiero GT.

Don’s Northstar Fiero and various other Cadillac V8 swaps that I’ve done.

Other Fieros I’ve had my hands on.