Old, new and conceptual roadsters at the exhilarating automotive event It’s impossible to spend a handful of days staring at automobiles—new, old, restored, conceptual—and not be impressed by them. But when the one-of-one, light blue and black 1932 Duesenberg J Figoni Sports Torpedo claimed best of show at this year’s Pebble Beach Concours d’Élegance, a long weekend’s worth of car musings clicked: the roadster is …