Tom Cotter is a barn-find revivalist who has made a career of finding and telling us about cars that “ran when parked,” no matter how mundane or bad they smelled. The hunt and discovery of a tired old car just makes the heart beat faster in the chest of an enthusiast. And Cotter has written a shelf of barn-find books, including “Cobra in the Barn,” “Vincent in the Barn, “Barn Find Road Trip” and also...