In four short years, Dave MacDonald went from zero to 500. His first road race came in 1960. Soon after, some of the biggest icons of the sport came calling to race their cars.
Zora Arkus-Duntov. Carroll Shelby. Mickey Thompson.
With marquee names came marquee events. 12 Hours of Sebring. Daytona 500. Indy 500.
Then it ended.
Second lap. Off …