In 1966, when the still-young Dallas Cowboys franchise ended six years of agony with their first winning season, the team’s owner and founder, Clint Murchison Jr., son of a billionaire oilman, was feeling ambitious. He believed his team would be good, even special, for years to come. With such dreams dancing in his head, Murchison found that the aging Cotton Bowl in Dallas’s Fair Park was no longer a suitable home for what would soon be dubbed “America’s Team.”Hole in the Roof:...