This is one of two ZO6 Corvettes delivered to Mickey Thompson, a California Tuner that had ties to GM.  A specially built big block motor was installed for Doug Hooper to race at the Daytona Continental on Feb 17, 1963.  GM had withdrawn from racing.  There was no explanation that this motor existed.  Tom McIntyre found the car and bought an exact spare motor at an auction of Smokey Yunick's property.  Tom owns the car which was the cover story for Hot Rod Magazine and was featured at SEMA.  More details:  http://registryofcorvetteracecars.com/ee/index.php/site/view_cars/56