For four decades they stood as sort of twin pillars of Daytona culture, perhaps unequal in frame and fame, yet connected in so many ways. If nothing else, each provided a uniquely Daytona experience. On one end of International Speedway Boulevard, on the edge of town near the interstate, is the hulking Daytona International Speedway, the corporate and spiritual home of NASCAR and the host, Sunday, of the 59th Daytona 500.