Kellison J6
In the late ’50s and early ’60s, fiberglass body construction stopped being high-tech processes exclusive to established manufacturers and became something drivers could complete in their garages. This influenced numerous small companies to start offering their plastic bodies to be mounted on a regular car chassis, creating a unique and interesting design. Most of those companies produced only the body, often with crude designs and poor fit and finish, but not Kellison (via Top Speed).
Established in the early ’50s, Kellison produced several successful kits for installation on popular models. But in the early ’60s, the company introduced the J6. The J6 could be bought as a kit or a fully built car, making Kellison a boutique manufacturer. The J6 used the Corvette frame, but Kellison didn’t just re-body the Vette. They moved the engine further back in the chassis, changed the suspension, and installed larger brakes and different interiors. That made the J6 handle better since the J6’s body was somewhat lighter than the stock Corvette. This conversion was popular and over 500 bodies or cars were built. The J6 was also successful in the hands of private racing teams since it offered Corvette power in a better handling package.