I believe this is the metal prototype for the Rockefeller Yankee, portrayed with one of its two 'fathers', Jim Rockefeller, in 1961. The car was eventually produced and sold in an unknown number, with fibreglass bodies - probably the first production fibreglass-bodied sports car in the US, as the first Corvette was delivered after the first Yankee was sold.
The sports car that it is distantly related to, is... also the Corvette. Because the company that built the fibreglass bodies for the Yankee was the same company that built the bodies for the Corvette.