many times rebuilt dizzies don't have any press left to the fit of the gear on the shaft, add to that an HV oil pump & heavy grade oil and you have a recipe for breaking pins
turns out the standard volume 351C pump is already comparable to HV pumps in other engines, now increase upon that & you're comparably running a DV (double volume) pump
when you went for your ride was the engine thoroughly warmed? it takes longer to properly warm the oil than it does the coolant
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