If all goes according to plan, Torrance Jackson expects an earthquake. An infield set ablaze. Maybe the frontstretch fence will be toppled over by spectators — their cold hands and cowboy booted feet climbing in a collective I-can’t-believe-we-saw-that high. Jackson isn’t alone in these predictions of mayhem. “I said, ‘Tim,’” — as in Tim Bryant, the racetrack owner — “‘what would happen if Bubba wins today?’” Jackson, who goes by TJ, says. He then smiles. “And he say, ‘TJ, I’m probably gonna have to build a new track.’” It’s a Sunday morning in December in Pensacola, Florida, a few hours befor…