Scored Main Cap Bearing - Ouch

pittsburghracer said

Put a 1/8 rod down through the oil pressure sending unit hole on top the rear of the block. If it falls straight through the block (with the rear main cap off) the 9/16 plug was never installed. If you fail to install this plug oil isn’t diverted to the oil filter.

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Or poke up from the bottom... the plug is something like 2" above the oil pump hole in the block (from the parting line).
IIRC... such a rod ought to drop something around 7-1/2" to 7-5/8" from oil pressure sensor hole to that plug. Measure and check back in and someone can check look it up.