This video from Gullwing Photographic shows the diversity of makes, models, years and sizes of racecars that participate in vintage racing. Everything from open-wheel racecars to a Volvo sedan -- even a fair number of racing specials.
For those of us into smaller cars, you don't want to miss the little red OSCA (the first car in the video with a driver and a passenger), the silver open-wheeled Formula 500 racecar and the little blue DB Panhard. There is also a Crosley-powered, Devin-bodied racer -- the Ver Valen Special (It can be seen running behind the OSCA).
If you want to see more, go to the VSCCA website.