I hate to go against the tide and burst bubbles but Chrysler DID build and SELL OVER THE COUNTER both bare blocks and service replacement shortblocks , though that particular block would have been neither a service replacement or a bare block stamped the way it is and WARRANTY replacements wouldn't be stamped like that either unless it was done by the guy installing the engine .

Did you find a tag riveted to the side of this block ? Remember that the VIN was stamped by a line worker , what does the VIN pad look like ???