Please help!! no oil pressure after oil change!!

Remove the oil drive shaft, I bet it is broken where it goes into the pump. I had a 383 where the valve seals became very old and made there way into the pump. A small piece made its way the gears in the pump and sheared the hex part of the drive shaft entering the pump from the remainder of the shaft.

Also, those shavings look like plastic timing chain parts - may want to confirm the timing chain and the valve seals..

Like what Locomotion suggested.....