George thank you for the offer to vet this car but at the moment I am just a tire kicker. I wanted to use the forum member knowledge to look into the car ad and the comments have been very insightful - just what I was looking for in trying to determine the real value of the car.
Also a GT5-s in the for sale forum that is interesting but no serial # iirc. I think I saw a car on DuPont Registry that claimed to be a GT4 or 5 with serial but when looking up the serial it went to a completely different Pantera race car with overhead exhaust headers.
Anyway I appreciate the replies and discussion.