1969 Dart GTS 440 M code documentation

I also have a window sticker from a 69 GTS 440 car that was sold at Mr. Norms, I have had half a dozen of those cars but currently only have one at my shop that I sold to a friend. The problem with the window stickers most say "H" code then have the Y39 Special Order which does not say that means 440, but we all know it did.