The 1959 Chevrolet looked like nothing else on the road, with gull-wing fins, cat’s-eye taillights and eyebrows over the grille. For 1960, Chevrolet calmed it down. The advertising promised “everybody’s kind of elegance,” and the car underneath the new sheet metal was nearly the same. Calm did not mean slow. The same 1960 Chevrolet that wore the quieter styling could still be ordered with a 348-cubic-inch V8, three two-barrel carburetors and 335 horsepower. And Chevrolet…