Why does he want to grind that away?
Because the filter pump won't seat all the way with that little nub there and oil blows all over the place.
When I had a filter pump, before going to a full flow system, I had to grind VERY LITTLE in that area to get the filter pump to seat.
I think the place Herb has marked is where I ground, but it's been so long ago that I hate to say for sure.
Maybe one of our engine guys can help here?