It's always special when a classic concept car goes up for auction, and that was surely the case as this 1956 Chrysler Diablo Concept crossed the auction block at the 2013 Barrett-Jackson event ...

1956 Chrysler 300B Kept in a Storage Unit for 40 Years Is Still All-Original and Gorgeous. ... V8 engine rated at 300 horsepower, it arrived in showrooms as America's most powerful car.

When the C-300 with its 331-ci (5.4-liter) HEMI was introduced a year earlier, it became the first American car to make 300 hp, but for its successor, Chrysler had even bigger plans.