Of the 38,762 1969 Corvettes made, just two were built for sale with the legendary ZL-1 427 cu.-in. race engine. One of those was a convertible. The original owner campaigned it for three years before storing it until 1989. Then, after 15 years of shows and some competition, it went to a second owner, who had it restored by the world’s top Corvette restoration shop. RM Sotheby’s estimates the next owner will pay up to $3M to take the car home from its Scottsdale auction.