Vintage shots from days gone by!

XP-785
Corvette Super Spider Concept Car

 

Pontiac compact prototype based on the Chevrolet Corvair, circa 1959.

 

Corvair Clay 1958:

 

XP-84
Corvette 1957

 

First split window studies, 1956:

 

No prototype - just real life:

 

Unibrow! April 1958 would lean towards that being intended for the 1960 model year. There's a few 1961 elements there too. The A-pillars would tell.

Edit: I meant to quote Steffen

 

Willys step van.

 

@EMD567

Great article - great pics:

http://www.deansgarage.com/2016/how-gms-radical-1959-chevrolet-came-to-be-2/