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Strange hole in Engine block

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Hi.  Sorry to bother this group but I need confirmation on a hole I found in the engine block on my 351 Cleveland out of my 1973 Mach 1.  I am replacing the intake manifold gaskets due to leaking and upon inspecting the block, at the front I notice this strange hole.  Based on how the metal is shaped, it looks like damage from something.  I have not been able to see a clear picture of the inside front of the engine block to confirm if I have a much bigger problem than my leaking manifold gasket.



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I concur that it is normal albeit strange and sloppy.



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To help put your mind at ease, here is a pic of a drain hole in my 71 D0AE-L block. This number is above where the starter goes if you were unaware. Also a pic of a '70 "J" block  that has drain holes at the back of the block. I'm not sure of the exact reason, but it was changed in early 71 to the current version you have. 


My casting number and date code.



1971 "L" block



1970 "J" block


 I learn something new every day!

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