mystery hole on 318 block

I saw it used for locating the block for different programs on cnc machines because this is a common hole on all engines. I But its purpose was to hold the back of the block in place while setting on the on the k member before the trans is installed. on the assembly line cart. A copy of the cart below on the one picture from the front you can see where the pin would go on the stand. This pin is adjustable and removed after the trans is installed this stand and pin fits all mopar V-8's. I will try and get a better pic of the pin when I get the next assembly on it.