The 85 unit could work, but it's not the best setup in the world. parts are surprisingly hard to come by (ck out the "Fiero Store" online store if you do this). the brakes especially are truely pathetic. the 84 - 87 uses a puney non vented rotor that barely stops a 2800 lb Fiero and the 88 vented rotor isn't much better. the 88 front end is even harder to get parts for BTW.
any Corvairs in your junk yard? on all years the front suspension is removable as an assembly similar to the Fiero, but it's actually much easier to get parts for (Clarks Corvair Parts) and, even though the're drums, the brakes are 100 times better (same as full size Chev of the era).

Good luck with it,

Russ