\t \t\t\t \t\t\t\tSeveral days ago,\xa0I wrote about the\xa01972 Lincoln Continental Mark IV\xa0and highlighted it was the only version of its generation that exhibited the purity of its designers’ vision, as the 1973 federal mandate for 5-mph bumpers scuttled its looks. This time, our\xa0Pick of the Day\xa0observes how the Mark IV’s direct competitor handled the mandate . . . but with a twist. This\xa01973 Cadillac Eldorado Indy pace car convertible\xa0is listed for sale\xa0by a dealership in De Witt, Iowa. | \t\t\t\t \t\t\t\t |