From what I have heard at SoundDomain.com forums, Dominick Iraggi makes good high-output alternators. I guess it's a hobby of his. His e-mail is
dominick@tds.net
I am not sure of these ones, but in search of the cheapest high-output alternator, I came acrosss
http://www.motorcityreman.com
I found this one for your car:
http://store.yahoo.com/motorcityreman/86le983.html
They have a 200 amp alternator that puts out 80/90 amps at normal idle speed {700/900 RPM}
I am not sure about them, but if you order from them, I could go down to their shop in Eastpointe, MI and give em' your thoughts!
TOC Admin
Brando