Clevites have a round oil hole in the mains. Not sure about the King bearings. But the hole in the bearing is not where the main shot of oil comes from. Where the holes intersect in the block the one on the "tab" side gets it. I drill a hole the bearing and match up that hole in the block and take a jewelers file and debur it.
Otherwise you can starve your rods from oil at high RPM. Or buy a main bearing with a "slot" and be done with it.
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