The metal bits in the sump might get a hard look to see what material they are. Conrod bearings are typically tin/aluminum over copper. The mention of conrod failures in history would guide me to thinking that there's no coincidence here. Conrod failures the result of a failing oil pump and a seized bearing? Is your episode an early, low-load low-RPM not quite complete conrod failure? From the fact that they red-tagged your initial replacement engine for a possible oil pump issue, it just adds to my curiosity about the cause. Bad batch of pumps or a new upgraded pump design? Obviously the factory is already sensitive to and on top of the possibility. Glad you are whole.
Is there consideration for a non-matching-numbers car affecting future value? Or better to have a factory replacement engine in its provenance? My crystal ball for such things is yellowed and cracked with age.
