I think even if that Vette is an original fuelie car it is special.
On the rivets. I am am not a corvette know it all, but have inspected some C2 vettes and I was skeptical after seeing those rivets on the first couple of cars that I saw. You would think they would have used a special rivet, but that is the same one I have observed, and understood as original.
So you have 2 68Z cars and This bronze may be # 3! wow