Here's the only pic I have of the line going into the back of the block...you can see it towards the bottom below the
oil separator tank at the back of the manifold...
BTW, my FE runs at about 70-75lbs when hot at 2500rpm/30-35lbs at a fairly fast idle (lumpy cam...about 1200rpm). Higher, of course, when cold.
My C6 Vette....using Moble 1, it runs at about 20lbs idle and never higher than 45lbs even at 6,000rpm. Doesn't burn a drop between changes and has 60k on the OD.
Go figure...