Double VIN stamping on M Code 440 Engine Block

Triple kind of stamp, very unusual!, but the font on each is the same! Never saw one stamped above the flat like that. I now wonder how they did the stamp in the first place! Thought I understood but! Someone got out of control in Trenton!

‘Cuda M-Code block for sure!

Is it the engine factory stamp on the front below the left side head, or the VIN number stamp just above the oil pan on the pass side????