Can't help much on the engine noise except to point out the obvious.
Bearings in the water pump or generator might be going out. You can test that ever so briefly by dropping the belt and running the engine for a few seconds to see if the sound goes away. The oil pump gear runs off the crank gear. It has a backlash tolerence that needs checked so it doesn't slip or get ground down by the crank gear. The crank gear should be tight if the keyway is good, it was shimmed correctly, and the crank nut is tight. I think the TO-20 doesn't have bearings on the cam, they ride right on the block, not positive on that though. I suppose it is possible the governor assby is loose on the cam gear. The oil pump gear can be checked by dropping the oil pan, the crank gear, governor, etc means pulling the front wheels to get to them. Oil filter cover, real reason for my post, been there.... Check your cover plate to make sure it is flat, not warped. Check the drop tube that screws into your center main bearing (that is the pipe your bolt screws into to hold the cover plate on), make sure that drop tube is straight, not bent (if the engine was dropped on that tube during a rebuild it can bend) If the pipe is bent you won't get a flush seal. Make sure your filter and that big cover in the oil pan are all set in correctly so your plate will push up flush with the pan. Make sure the oil pan flat around the lip isn't buggered-up, that is the actual seal point for the gasket. My little insurance policy... run a thin bead of silicone gasketmaker around both sides of the big thick rubber gasket when you install the cover plate. Make sure you center the rubber gasket so it mates to the flat of the oil pan all the way around. I've heard of warped oil pans that prevent good seals, but never seen one myself. George
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