65 barracuda Commando 273 /Formula S?
A 1965 Formula S would have a tach on the left side of the dash. Also the rear valance would have a rectangular cut out for the Commando exhaust resonator tip. Front sway bar too. Spare tire cover would have a "C" cut into it to accomidate the larger Formula S spare tire.
I have a 1965 non Formula S, Commando equipped Barracuda. I think they are more rare than the Formula S.