I beleivwe T-3 turbo was on the Turbocoupe till end of 1986. 87-88 had an IHI Turbo which if I remeber correctly is somewhat smaller but spools faster than the T-3. Your best bet for finding these is at Nato (North American Turbocoupe Organization)
The url to their forum page is
http://natoubb.turboford.org/cgi-bin...assCookie=true
Hope this helps and good luck!
Vincent