The 1978 Mason-Dixon 500 was a Winston Cup (now Nextel Cup) event held at Dover International Speedway on May 21, 1978. David Pearson led 147 of the 500 laps in route to a dominating twelve-second victory on Cale Yarborough. Benny Parsons finished 4th and reclaimed the points lead by thirty-six markers on Dave Marcis (15th). Stats