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Well, I guess that the last place those pieces could have come from is the gear train at the front of the motor - or - just some junk left behind as a result of sloppy workmanship way back when.

:) Good news! Congrats. The 'bad' bearing shell you found - could you swap the inserts top to bottom? There is more stress on the lower main bearing inserts.

Don't the rod bolts just take a 12 point socket?

One point of clarification on my previous post: it looks like the pieces you found in the oil pan are themselves too large to have been circulating through the oil passages. Probably, it was smaller pieces of whatever they were that got caught up in that main bearing. A whacked-off edge of a...

What he meant is that the crank is cross-drilled. Of the oil that goes to a main bearing, some drips back to the pan but a lot goes through the cross-drilled hole to feed a connecting rod bearing. If junk got into that main bearing, then some junk could have gotten to the associated rod...

Those marks look like damage caused by metal bits circulating through the oil system. The slight scratches on the crank journal(s) is insignificant. You can install new bearing shells as already stated by m16. You should try to see where the particles came from. Check what you can get to...

X2 on 'piled up' material. I'll bet you a box of donuts that they are leftovers from the original manufacture or a rebuild.