all through the 60's the teams ran the same car on pavement and dirt. I believe it was about the mid-70's(?) into the 80's that the roadsters began to appear on pavement (Sorry, I'm really foggy on specific years). One that really stands out for me was the red #56 Genesee Beer Wagon that Sheldon Kinser drove. I believe it was Galen Fox's car, or at least he worked on it. Greg Weld also had a pavement roadster for a while. It was a blue car. They even tried them on dirt a few times. A guy who did run his roadster on both dirt and pavement regularly, was Lenny Waldo. The car was pink and I think was a Ford. Also, there was a year, or so, in the 70's when Sneva had an old rear-engined Huffaker indy car converted to a sprinter and a guy by the name of Dave(?) Rorhrig that had a purpose-built rear-engine sprinter. USAC, however, put a stop to the rear-engine stuff pretty quickly. The era of the pavement specific sprint cars was the beginning of the end for USAC's supremecy. Teams began folding and car counts dropped drastically at the pavement shows, especially.