Yes it is, it's so common I overlooked it. I was referring to the dent on the top with the bare metal and surface rust on it.

My 1960-1962 big blocks don't have that relief. But they are 4 bolt covers. 1967 and 1968 have that relief there from 382-2bbl to 440HP. I'm thinking it is for HP b-body manifolds and they put it all covers to have themselves coverd. Not really needed for that because 1979 covers are the same size and lack that relief.