looking for a real fm3 demon 340 1971.

Yuri said
My 1974 Duster has FM3 underneath the factory FE5 in the engine bay. How weird is that?

I would have to say that someone at some point in time had it painted that color, or drove over a Mary Kay's car.
FM3, Molin Rouge or Panther Pink was only available on late '70's and 1971.
This is one of my resources.

http://www.mymopar.com/highimpactpaint.htm