Postwar Mercury Customs share Pebble Beach’s 18th fairway with the world’s finest classics, racecars and sports cars. More than half a century after Ken Gross watched the coolest guy at his high school drive down the street in his chopped ’51 Mercury, he put together the first-ever postwar class of Mercury Customs (Class R) to be shown at the Pebble Beach Concours last weekend. A Pebble Beach Selection Committee member as well as Chief Class Judge and automotive journalist, Gross has made it h...