Right away I thought," did you forget to torque a rod cap. My brother did that on a Volvo P1800 years ago when someone arrived with a box of browns. Knocked the rod out the side of the block. Pieces on the floor. Dad helped after that. They took the block and pieces to a welding shop where they brazed the pieces back in place. It was a low stress area so no worries. New rod and grind the rod journals.
I worked at a service station in a small town. The farm boys with F150 trucks with the 400 engine would come in and ask me to put an oil pump in. The oil light would flicker at warm idle at stop signs. I would check the oil pump and none had appreciable wear. The rod and main bearings wear copper all the way around. These engines all had about 100k miles, so I would poke at the timing chain from below and naturaly they were done. So I would do up an estimate and phone them for authorization. Now the Cleveland Ford engines are known for a poor oil system, which explains the bearings.Cam bearings were probably showing wear also, but a bearing rollin and new double roller timing set and they ran like new. Every owner complained because I did not put an oil pump in. I said they should drive it for a few days and if they still thought I should put an oil pump in that if they paid for the pump, I would install it for no labor cost. Never had to remove the oilpan to put a pump in. With your 10PSI oil pressure, I would be concerned about worn bearings. If the bearings are worn too much oil gets flung off the bearings. It may flood the rings and burn oil or with windage get oil up to the breather.
