With 306 horsepower and 329 lb.-ft. of torque, the Shelby GT350 was Ford’s high-performance Mustang. Important changes to the GT350 for the 1966 model year included functional quarter panel scoops delivering air to the rear brakes, the addition of rear seats, and a change to C-pillar plexiglass windows in place of the previous year’s air vents. An automatic transmission was also available.