Well, the S&M color scheme is very well known, BUT the car could have been painted to mimic it.
Their lettering is what you're gonna need; there may be some "witness" in the paint if carefully sanded & polished to see it.
Talking to Buddy Martin would be a really good idea. I think it was Buddy who'd procure the cars. Not sure how many '67 RO cars they had, may have been two, or perhaps 1 440 car and a Hemi car.