Unfortunately, I don't believe you will sell it at anywhere near that price. I owned a car, very similar, for 81000 miles. Original white paint, new stainless brake lines and some other upgrades. I sold for $2500, and that was a struggle to find that price. Truth be told - true "fiero" people know that these cars are cheap to get into - cheap to repair - and unfortunately cheap to get out of. If the paint is as clean as it seems, and the seats, carpet, and dash corners are clean with no rips, and the trunk still looks new, you *might* get 3K - but I bet you will be around $2500.
I bought my current Fiero - 86 GT, original red, rusted oil pan, but otherwise runs and drives great, with only 61K on the clock for $1200. Sorry man - Ive had 8 Fieros, never spent much to get them - and never got much selling - but always fun little cars. Good luck with your sale.
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Todd Thorson
Current Fiero - NONE!
http://www.toddsplace.com