My initial reaction is fake. The "0,1,5" look different (see MMC photo attached).
However, I would chemically strip the paint there to see if the leg on the 1 is filled in. I see the outline of the last 7. The 0 could possibly have a beat-up edge but the curve looks wrong. You could then also verify the look of the stamp pad milling marks.
Also add to investigate and post some photos:
-the block casting = date and "2536430-x" where "x" (the mold#) should be consistent with assembly dates
-the top block stamp pad = F440HP with assembly date
-SPD on tag and door sticker = Nov 30,1969?
-trans stamp = probably done at same time, the fonts and levelness (or lack of) should match exactly
Some warranty blocks were stamped with VIN by the dealer, I wouldn't expect those fonts to look like factory.
Question: your car or looking to buy? A NOM on 'Bird could reduce $$ by 50K!
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