aarcuda are you inverting pictures or something. The reason I ask your picture of the pump shows it's location on the rear drivers side of the engine. Which is correct. Then you show a pick of your pan with marks all around the rear corner passengers side of the engine. You either inverted your picture or was clearancing for something else.

I ran these pumps for years without any clearancing on many different pans. Now when I ran a 4.125 stroke with alluminum rods I had to space the pump off the cap with a .125" spacer. Then I simply put the pan on with no gasket. Taped on the pan to make clearance so the pan would fit. Then simply reinstall with gaskets. No problem.

Leon