That conversion is a Testerossa body kit away from a true 90's wannabe dreamby the time 1988 rolled around, with the new suspension, these cars were the best they could have been (but we shoulda put the 4.1L or 4.5L V8 in it (i drove mules with that engine) ... then we killed it.
V8 conversion via the "Archie" kit (V8 Kits)
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https://oppositelock.kinja.com/this-fiero-gt-finally-has-the-v8-power-gm-should-have-g-1765737072
I was approached by a guy who wanted me to start assembling those kits, back then... he was sure it was the next big automotive craze.
I bet the 4.5 was a fun ride, but I'd still rather an Allante if I was to suffer with one.