Looks like thats been running with an object of some sort hammering the piston and head.

In the second pic down, the piston appears to have a small hole appearing in it, this will need replacing. If the others clean up and they are still 'piston' shaped, you might get away with it.

While the heads are off, I'd also get the valves out, clean them up and re-seat them, you might even need new seats / followers (depending if there is any play).

To be honest tho, its not a pretty sight!