I would see if you could find an 8620 cam core for the replacement, and verify with the cam grinder you absolutely have enough spring load to keep the valvetrain under control.
I would also be trying to figure out what caused that witness mark on the lobe.
I don't know what your combo is, but it's the kind of mark I'd expect to see if there was some minimal contact between an aluminum rod and the cam.
Since you have an aluminum block its also certainly possible that just before/after the cam actually let go it whipped around inside the cam tunnel, and that's just the mark that was left.
If so, there should be a corrosponding mark in the tunnel where the contact was made.
when i first started using this cam we found we had valve float. the specs that Bullet told us were just too light. i chewed out the lock area on the valves in the first season. i went for new valves & stiffer springs the next season & the ET dropped 0.1 on average. the valves are now looking good except theres a few bent ones after this happened.
the mark on the lobe wiped off with a rag. just milky oil with all the rain we've had lately. i have heavy dew in the mornings on all the steel in the shed. i'm sick of the rain. its winter here
The rods are Steel Molnars so no contact. The Cambelt drive actually controlled the cam quiet well when it broke. I was taking a passenger for a ride at the time, had just pulled second gear after the fronts had touched down when pop & we went into coasting mode.