I know this is a old thread but just a side note to it.
If you look at the line above the engine number it looks like the block has been decked but they stopped the milling machine just above the engine number so as not to remove the number.
This has partially removed the top of the numbers which has made it slightly harder to read but means a re stamp and renumber was not needed.
If you do have a genuine block for a genuine car and are going to get it rebuilt I would suggest to the machine shop to do this as it will save a lot of trouble in the future as to it being a genuine original block.
The machinist will curse you but well worth doing.
Cheers Paul.