Michigan USAC 1970
BROOKLYN, MI - JULY 4: Gary Bettenhausen (#16), eventual race winner beside Mario Andretti (#1), in turn three, lead the field into the USAC Champ Car race as part of the unusual Twin Bill for stock and open wheel racers on July 4, 1970 at Michigan International Raceway in Brooklyn, Michigan. (Photo by Alvis Upitis)