I have a 1987 Turbo-T, rare D-84 silver over gray two-tone I might part with......if the price is right.  It's Canadian built has 55,000 original miles, fully original on the exterior/exterior and I'm the 2nd owner.  I have full documentation, window sticker and all the OEM parts stored.  Original Canadian owner had a GNX style dash from VDO installed, stock 1992 GMC CD stereo installed in the OEM hole, $18k into the engine yet everything maintains a stock/OEM appearance to the untrained eye.  I don't have the dyno sheet but he said it was tuned to turn 457HP at the rear wheels although I had it detuned via chip to run street fuel.  It was bought and built as a killer sleeper and yet still runs and drives as an OEM Turbo-T.  Just drove it yesterday for several hours and blows ice cold A/C with the cruise control and can be driven by any grandmother to get groceries.  No idea what it might appraise for but wouldn't part if for less than $50,000 considering only @ 4,700 Turbo-T's were built in 1987 and even fewer were D-84 two-tone units.  Dennis Kirban couldn't confirm how many were but said over the phone but confirmed "not many".  Only options not included on the window sticker are: Digital Dash, Twilight Sentinel, Trunk Kit and Factory Alarm. 
Nothing under $50,000 would take it considering the rarity of how these rare vehicles are becoming.