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I would place a bet on torsional fatigue. The torque required to turn the cam is periodic, this gives rise to fatigue. There are also minor bending loads from each tappet (lifter) which add to fatigue. And then the helical gear mesh load on the drive side, compounded by the injection pump...

OUCH! When the cam stops turning, pistons will smack valves. In a pushrod engine, the damage is limited to valves and pushrods. I see a new cam, tappets, pushrods and reworked heads, at a bare minimum. Do NOT reuse any valve which contacted pistons, when you pull the heads, you will see the...