Returning to GM's "fast old man" division, we now focus on Buick's Centurion. Intended as a replacement for the Wildcat starting in the 1971 model year, the Centurion was big, fast (with the optional frame-twistingly torquey 455, anyway), good-looking, and could be had with a convertible top. Not only that, it was named after the super-space-age 1956 Centurion concept car. Unfortunately, OPEC ruined the party for Detroit battleships that got single-digit gas mileage, and the Centurion was axed after the 1973 model year.
Buick Centurion Registry [BuickCenturion.com]
Driving Big Cars, Getting Gas From Getty [internal]