My 1969 M Code 440 Dart GTS

Back n about 1995 I had the chance to have bought from the original owner, an M code cuda # engine and all, just missing the hood scoops but that's another story. He told me of an original M code 4 speed car in St Louis, he swears was original, supposedly the only one. (one of none??).
I had a #'s 67 383 Cuda but it was changed over from an auto. Surely a 67-9 A body 440 would have been easily doable with the 4 speed.