What "makes" a 66 Barracuda a Formula S ??

My old car (and Lilcuda's old car). NOT a Formula S, but had everything except the badges plus disc brakes. Commando, tach, handling package, discs, 14" wheels (although they were the 4.5" wide), four speed. It originally had a 7-1/4 3.23 rear, but when one axle broke on me I put a '67 A-body 8-3/4 3.23SG in its place. Also, not an original black car with black interior (what I changed it to). Last pic is what it looked like in 1981 shortly before I sent it off for paint. It was an original vinyl top car, as well.

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