The dirt track spectacle hearkens back to the origins of NASCAR — moonshine runners attempting to outrun the law in rural Appalachia.Stock car racing is about to get very dirty. On Sunday, NASCAR’s Cup series will race on a dirt track created at the famed Bristol Motor Speedway.While the sport’s truck series ran one dirt race a year from 2013 to 2019 (lockdowns canceled last year’s event), Sunday’s feature represents the first time the sport’s premier series has raced on dirt since September 1970 — a race won by stock car racing’s “king,” Richard Petty.Bristol TransformedThe race this coming weekend,...