David Olson and his minimalist 1950 Jaguar XK120 raced for Group B honors. Photo: Jim WilliamsSteve Cook’s 1974 March 741-Cosworth was one of two F1 cars in the large formula car class. Photo: Jim WilliamsPeter Giddings brought out his 1950 Frazier Nash Mk1 LeMans Replica. Photo: Jim WilliamsRoss Lindell’s 1963 Sprint Speciale and Sid Gage’s 1957 Giulietta (58) head this pack of Alfas. Photo: Jim Williams