340 with metal in oil pan

jason's duster said
This is the cylinder that has the piston in upside down. No loose springs etc.

View attachment 1715461180

View attachment 1715461181

Either you "missed" on matching the head to the piston or someone has been in there since the valve strike, those valves don't appear to have hit that piston. Sure you didn't flip something and take a picture of the wrong chamber on the head?