PEBBLE BEACH, Calif. (April 22, 2008) — Fifty-three years ago, the LaSalle II Roadster and the Chevrolet Biscayne were among the concepts that showcased General Motors’ vision of the future in its traveling Motorama. After the debut of this automotive eye candy, these cars were not only discarded but destroyed. Joe Bortz, who was a young boy when he saw these “dream cars” at the 1955 Chicago Auto Show, found their remains decades later in a…