American muscle “Forever” Raw power gets a stamp of approval with a new series of limited-edition “forever” stamps issued by the U.S. Postal Service. In a ceremony at the Daytona 500 in February, NASCAR champ Richard Petty and Postmaster General Patrick Donahoe dedicated the series of legendary iron, known as “America on the Move: Muscle Cars Forever.” The stamps feature five cars: a 1966 Pontiac GTO, ’67 Shelby GT-500, ’69 Dodge Charger Daytona, ’70 Plymouth...