For 1958, Chevrolet models were redesigned longer, lower, and heavier than their 1957 predecessors, and the first ever production Chevrolet big block V8, the 348 cu in (5,700 cc), was now an option. The Bel Air gained a halo vehicle in 1958, the Impala, available only as a hardtop coupe and convertible in its introductory year. Impala styling followed the basic lines of the other Chevrolet models but received special styling cues including a different roof line, a vent above the rear window, unique side trim, and triple tail lights housed in slightly broader alcoves. For the budget conscious, the Biscayne, (formerly the 210) and the Delray (formerly the 150) completed this model year’s family-oriented and utility offerings.
Pat Boone and Dinah Shore, 1958 Chevrolet