I'll have to bang up the windage tray a little to make place for the
oil pickup.
But since my rear main seal is leaking, I took out the
oil pan again, replaced the seal, and I am waiting for a new Melling HV
oil pump to arrive to be put into the engine.
It may be that the scars I see on the two rotors in the actual pump are not so normal and oil pressure is leaking out there. The Melling HV oil pump I have right now went trough the munching up of a cam lobe, a lifter and several bearings, so it may have been worn excessively by metal particles. Well, it's only just about $35 to find out if that is the culprit of low oil pressure.
I'll keep you posted on this.