Wow, I haven’t seen a rod bushing tore up like that. However the 10 hp motors were notorious for beating the wrist pins loose in the pistons. To correct that, the pistons, rods, wrist pins, and wrist pin bearings were replaced with 1961-63 parts. That gave larger wrist pin diameter and the same roller bearing as large motor had. If you take the piston number and follow through with the superseding part numbers, you will find a list of the parts required for the update.
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