360 engine sudden drop of oil pressure while cruising at 3200 rpm

The one consistent thought through all this is it's not likely to be a fix from up top. You are going to have to 'dig' into the engine to find out. What was suggested was just troubleshooting methods to better locate what actually is going on. Again, bottom line is YOU are going to have to pull that engine and tear into it to fix it. Maybe not right away, but eventually you will have to. At least that's what I would do.