Sorry about your discovery, mate! Too bad it ain't gold!! I'd place a magnet on the slivers to check mat'l. Magnetic, iron-cam, lifter, or crank. Non-magnetic-lead or alum-bearing mat'l or piston.
You can check the flat lobe by checking valve adjustment with feeler gauges. You adjusted them some time back, they shouldn't have loosen since then. So, if you remember the gap you set them at before, use this thickness as a guide and feel the gap. Any great looseness would likely be evident of a loosen adjusting nut, pulled stud, bent rocker arm, or, worst case, a beginning to flat lobe.
If that fails to produce any results, then dropping of pan to check bearings would be another start. One can remove the pan without pulling the engine. but, if you find bad bearing, obviously, the crank will need some type of repair, so pulling engine would be evident.
Might want to consider adding an oil accumulator with a valve on it to pre-oil before start-up.
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