Disc brakes on all Formula S cars?

I have a 68 383 Formula S Barracuda. It has front drum brakes (and a front sway bar). I was under the impression that all Formula S cars came from the factory with front discs as standard equipment. But it looks like mine have never been tampered with. Then I heard of another Formula S, 68 that has never been touched, and it also has drums up front. I was told that discs were in fact not standard equipment on the "S" cars, but an option. Can anyone confirm this?
Author: admin