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

66fs said

And what would be the difference, if it had all the right parts? It would still be a great all around driving car.

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This car has all the formula S suspension parts and the 4bbl engine. You could order all the Formula S parts except for the badging and stripes on any Valiant, or Barracuda in 65/66, it just won’t be a designated Formula S. It will be rarer than an S car tho, which doesn’t really mean much.