Chevrolet Corvair Monza SS Concept
The Chevrolet Corvair Monza GT coupe toured together with the Monza SS (Spyder) in early 1963, making a further public appearance at the New York Auto Show. Although both cars were based on the Corvair drive train, each represented a futuristic development of the adaptable Corvair design. In the SS convertible, the engine (with a four-carburetor setup) was left in its stock location behind the transaxle, allowing a shorter (88 in (2,200 mm)) wheelbase. Although the SS came very close to production, both cars remained concepts only. The Monza GT is housed at the GM's Heritage Center in Detroit.
Source: Wikipedia, 2012