Did the 360 ever come with a forged crank?

Howdy all, cosgig here! I have a very early 1971 casting 360 motor with what looks to be a forged crank dampener on it! I was under the assumption that all 360's came with a cast crank, and I am aware of the physical differences between the 2 dampeners, so I am looking to the knowing gurus of the FABO world!! Did the 360 ever come with a forged crank?? If so, was it changed to a cast crank the same time as the late 72 340 motors?? The trans that is mounted to this motor specs out to a C body 1972, which I assume is what the motor came from also! I believe that only the C bodies came with the 360 until 74, is this correct?? What do I have here?? Thanks for any and all replies!! Geof