In an elaborate commercial production, Chevrolet and Campbell-Ewald put a woman in an Impala convertible on top of towering Castle Rock in Utah to prove “Chevrolet stands alone in ’64.” Chevrolet years later remade the commercial to promote the 1973 Impala. Chevrolet in spring 1964 produced a 5.5-minute commercial showing travel scenes of the U.S., following its 1962 long-form ad. Chevy aired another 5.5-minute blockbuster to introduce its 1965 models. •1964 Chevrolet U.S. vehicle sales: 2,542,4