Yesterday I picked up the complete 85-87 crossover heatshield set from Robbie. He let me browse through his garage and store of Fiero parts. I don't know if I can remember all I saw, but if you need something, ask here and I'll try to remember. I do know that there is a ton of wiring harnesses. For what, I don't know. There are 3 or 4 crossovers with head pipes, exhaust manifolds, and lots of ECM's, both manual and automatic and even a base 88 5-speed. Lots of intakes, too. 2 engine blocks wrapped in shrink wrap. Don't know if they're rebuilt, or not. I saw at least 1 set of rebuilt heads.
For the wiring harnesses, you'd probably need to pay a personal visit to determine the right one.