Reply to "what year?"

My GT5S carries vin 9425 and it is an '86. There must be a combination of typo errors in the EBay listing as the GT5S model was not produced in 1980.
I believe manufacture began in 1984 with 1985 being the first model year. Charlie McCall has the first produced I think.

The later cars all have dropped floor pans, improved electric wiring, rotary a/c compressors, and so, many base improvements seen as "required" on earlier cars are in place to start with. I know of a stock GT5S in beautiful condition that recently went for $55,000 in Florida. Another, a month or so earlier, with a stroker motor in Ft. Lauderdale went for $62,000. within a day or so of it's listing. So, the evidence would seem to indicate that there is an active market for the later cars.