Hmmm. It looks as if the replacement interior is from a pre-'88. Wrong seats. Lighter grey on the A pillar & door panel. Dash looks odd. Dunno what's up with the shift surround. The left map pocket is missing. It seems to have pre-'88 snowflake wheels. That is an odd glove box for an '88. Since the '88 had different size wheels/tires, this makes me wonder... Weren't parts for '88s available in '88/'89?
It would be interesting to see behind the dash. If there was a cabin fire, and the seats, instrument gauges, door panels, and A-pillar trim went, it would seem that the rest of the interior would have been trashed. So, probably the headliner, sunroof, windows, etc. I would worry about electrical gremlins & extra rust. More pics would certainly be helpful.
After the RF sidemarker was replaced, it would look like an OK '86 GT, from the pictures.
[This message has been edited by tshark (edited 11-15-2014).]