Pull your fuel pump. Pictures are hard to tell but it could be off the fuel pump. Pull the motor and get it evaluated.
I AGREE Or one from another pump along the way. Are the other chunks metallic? Side to side movement on the rods is normal to a point. Can't remember the specs but they're in the books. Up and down movement I would proceed with pulling a few bearing caps before giving the motor it's last rites
Or one from another pump along the way. 
