The bottom pic in post #3 is quite interesting. The block appears to be a side oiler casting that was not drilled for side oiler
oil delivery.
The
oil galley bulge along the side of the block above the side bolts is clearly visible in the bottom pic of post #3. It appears that Ford ran the cutter for the engine mount boss machining operation deeper than normal to cut into the casting provisions for the
oil channel. Above each side bolt you can see some or all of the associated boss that would have been drilled to the main saddle for oil delivery.
Quite an interesting block! Perhaps it was from the end of a side oiler casting run and the factory was producing top or center oilers for say industrial applications? It is possible someone made the decision to machine it as a regular block not withstanding its side oiler casting heritage for expedience instead of using the non side oiler casting ...
Ed