There's one sitting in a yard not far from me but I'm not sure if it's a Boss or Mach 1. There's no decals to distinguish.
Do you have any pics?
ford did not mass produce any mustang of that time period with wide scoops the B9 was the only car to get them
the B9 cars also got white BOSS 429 stickers on the fenders and only came in yellow white raven black a green ugly teal color a grabber red and blue nut people fake these cars so good chances are its a fake. the 69/70 fastbacks do look good with B9 scoop though.
they sat a tad lower in the front and the front suspension were a bit wider than normal mustang's