Cliff Ryan guides his 1965 Mustang through the infield. Photo: Chuck AndersenDon Herman fends off the pack chasing his ’69 Datsun 2000. Photo: Chuck AndersenUp on the banking is Charles O’Brien’s 1974 Porsche 911 RS. Photo: Chuck AndersenThis tidy 1963 Lotus 23B was driven by Robert Boller. Photo: Chuck Andersen