[RichardJ]

>> Seat is shot but has a cover <<

That alone says it has 177k miles or more.
Chances are it DIDN'T run in 1999 and that is why it was parked.
With cash in hand, offer what you think it is worth to you and can afford. If he says no, turn and walk away. Remember, he called you and a good chance he'll call back.

If he really is interested in selling it and is in good of shape as he would have you believe, he can pull it out, clean it up and get it running.