1968, Z28/44K miles

[kmh1031]

OK, over the past year or so I have come to appreciate the knowledge of the people who comment on this site. Therefore I would like your opinion on something.

Today in my business travels working in Boston, I came across a 1968 Original Z28. It has 44K documented miles, and has no PS, but AM radio, original tranny (M21) rear, and original 302 engine and is british racing green. Owner has owned it for 15 years and the engine is highly detailed, and has the smog equipment still attached. Original wheels, and tires as well. Body is in excellent shape and only one fender has been replaced due to a wreck in 1970.
Original owner is still available for comment and further documentation.Interior is in perfect conditio n as well. I, not being an expert, would call the car a #2 condition car.
The current owner (2nd owner) drives it about 80 miles per year and it takes up needed space in a building he now needs.

The car was originally sold in OK and the salesperson who sold the car in 1968 to the original owner is still at the dealership after all this time, yet is now the Sales Manager. He remembers selling it to the owner. Perhaps additional documentation possible here as well.
I was unable to get pictures at the time I stumbled on the car. He is asking around $40K for the car. My question, based on the limited information I have given you is, what is the car worth, and is $40K in the ballpark?
Thanks for your comments.
Mike