Throughout the NASCAR Cup Series season, you’re bound to see a few surprise winners. Tracks such as Daytona and Talladega tend to play well to the underdog. Darlington? Not so much. The Lady in Black is as unforgiving as any on the schedule and if you’re going to find Victory Lane, you must overcome the Track Too Tough to Tame. And so, when you developed a shortlist of drivers who could get it done in Sunday’s Southern 500, the regular season finale, Chase Briscoe probably didn’t come to mind. It’s nothing against the Stewart-Haas Racing ace, but being in a must-win situation at Darlington isn…