The seller is a member here and has posted other cars for sale here before. I am sure there is a reason he has not posted it here. We will have to wait and see.
He was trying to work a trade for the car with one owned by a guy I work with. Only problem is he wanted to trade the car for a comparable upgraded and every bit as fast GN with 1/3 the miles. However, he would only trade even and bring no cash to the table.
I am pretty sure a garage kept, collector quality, high 9 second/ low 10 second 1/4 mile GN with miles in the 20k range is probably worth more than this car. I think the GN would be worth much more. Not sure, but that's just me.
Not a very realistic expectation in my opinion, but you never know, there is an a$$ for every seat or so I am told.