Jerry Ruth won both T/F and F/C a number of times at the Div 6 races in the early 1970's. Back then, the driver could run both classes. Today, a Pro driver can run 1 Pro class & also Sportsman class. I dunno if the driver could run, say, T/F, T/D and S/C at the same race.
There was a time1961 Nationals at Indy, when 1 driver raced 2 different cars in the same eliminator. What comes to mind was a fellow named Walt Knoch, who ran the equivlent of Comp (called Junior Elim) at that race. Had an A/A & A/R (A/Roadster), both blown Chryslers, and he ended up having both cars in the final. I seem to remember he picked the altered and made a run for the win. The altered was called Walt's Puffer (cuz it was supercharged) and I had a model of it when I was a kid.
Below is a photo of the two cars.
LOUD-PEDAL photos: 1961 Walts Puffer II's (2)
public.fotki.com