metal in oil pan

You may just have crud left from an earlier repair. The cyclinders look like typical high miles wear to me. You wont hear anything from broken rings. But the cylinder wont hold much for compression when tested. I ha da 340 I detonated a ring land apart on. I found the two oil rings (the thin sections) wrapped around the camshaft, and expander and aluminum bits in the valley area in addition to the pan. Windage does some interesting things with broken parts. Really the only way you'll find ou is to pull the pistons and rods out. And...BTW....I hope you only take pics in sandals. You're an idiot if you do engine work in open toed shoes.