Pftttttt V-6, total weakness.

Go all out and do a Lexus/I-Force V-8 swap.

Swaping a Chevy small block (not LT1/LS1) into the Fiero was pretty common because the engine uses the same bellhousing as the transaxle. People have even swapped the Northstar DOHC 32 valve V-8 into the Fiero, generally with the FWD transmission too.

You should be the first do have a V-8.