m code barracuda

If you have an original 4 speed car then it is not an M code 440 Cuda since none were built with a 4 speed, all were automatics from the factory. There should be a M in the VIN at about the 5th digit I believe.
Some good info here.
http://board.moparts.org/ubbthreads/showflat.php?Cat=0&Number=6998511&an=0&page=0