The only way that another "real" race car class would work would be if the cars were completely different from USVTA cars—and that includes bodies, motors, tires, batteries... everything.
I'm actually hoping to be able to utilize something very close to the full rules package for the VTA, but for a class of SHORT Track Oval Racing...except, It'll be something more along the line of a R/C Street Stock class with more of a OVAL Racing paint scheme look and feel. (Same basic body rule though)