Obviously, the oil pump builds the oil flow/pressure and it gets leaked away through the rod, main, and cam bearings, lubing and cooling them as it flows.
As those parts wear, it all adds up. Some of the smaller Farmalls are known to warp the oilpump cover, causing an oil leak there which only leaks worse as the oil thins when warm. I'm sure others with more "H" experience than I will chime in and tell us if that could be a factor here.
Old-time mechanics would sometimes drop the oilpan and then pressurize the oiling system from an external source and look to see which bearings were passing the most oil.
After checking out the oilpump, you can drop a couple of rod and main caps and Plastigage the bearings to see what the oil clearance is.
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