440 problems ,new motor

i think Dave69 is correct or closest i can figure as long as his scenario can happen after i shut the motor off.
The engine was running , we heard a small pop, it was still running for about 15 seconds after that with no charge in sound or idle. I shut it down to determine what the pop was . we didn't find any obvious damage. we tried to restart it and it did not fire. this is when we found the cam not turning, so the cam seized after the engine stopped, when we tried to restart it the dowel pin broke ,then the bolt broke. I guess this sounds like the story .I think its a good idea to pre oil with out the cam in to make sure the oil is coming through the journals ?? Any thing else to watch for going forward next week