Rare 4-speed

What year is on the case of your 18 spline? I was told a story from an old hemi racer that some of the a body hemi trans were made by Chrysler in house and left out the back door and given to racers. I've got 2 of them. Especially the older ones because they never made an a body hemi trans for assembly cars. Does yours have a vin pad on it?