Base engine remained a 155-horsepower, 250-cubic-inch six, but the underside-end V-eight grew to 327 cubic inches and 235 horsepower. Once again the Tremendous Sport was an engine/trim package that price $422. A total of solely 2,455 have been ordered on the Impala Customized Coupe, Sport Coupe, and convertible. A 390-horsepower, 427-cubic-inch engine gave every Super…