Ford built the 1964-66 Thunderbird to win at the country club, not the drag strip, and for the most part that is exactly what it did. But buried in the order books was an ultra-rare 427 side oiler V8 option that dropped the car’s 0-60 time by two full seconds, and fewer than six are confirmed to survive today. Read on to find out what set this hidden performance variant apart from the luxury cruiser everyone else was buying.