In the fall of 1963 , MacDonald rose to national prominence after piloting Shelby King Cobra CM / 1/63 to victories in the two biggest and richest road races in America - the Los Angeles Times Grand Prix and the Monterey Pacific Grand Prix .
In the fall of 1963 , MacDonald rose to national prominence after a dominating five - week performance on the USRRC and NASCAR circuits . 
 During that period he drove Shelby King Cobra CM / 1/63 to victory in the two biggest and richest road races in America - the Los Angeles Times Grand Prix and the Monterey Pacific Grand Prix .