A most interesting vehicle. Do you have the data card? With the black valve cover, the chrome fuel injection lines (what appears in the photo) and the lack of spot welds on the front fenders (again difficult to tell) this could be a "car show" prepared vehicle.A rather rare combination.
If you have the data card, the special option codes will be between 994-997. The technical manual specifies which level of show the car was prepped for, that is, was the engine set up for show (the black valve cover, the chrome lines and the missing front fender spot welds).