I have a late B with engine stamped the same way yours is, number M217272G. The date code is 8.19.Q and it has the old "D" part number. My serial is 1,373 less, suggesting your serial number was 214,400 or so. That would have been built in August.
Since your block is lower than mine but the later part number, there are 2 explanations.
1) The block was replaced. Replacement short blocks were not stamped. Whoever replaced it stamped the old number into the new block. (Seems unlikely.)
2) The factory was doing pilot construction and verification of the new block. New style blocks that checked out after machining were used for production. I know this was done some, as I have seen parts with the word "SAMPLE" cast into them. (Seems more likely.)
You should be able to verify either way by checking the date codes. If the date code is August '47 or earlier, it is probably original. If it is later, it has to be a replacement.
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