My First 318 Rebuild

I'm not done with the heads, but I'm getting to the point where I might just have a shop go through them and put new guides and such in, it seems like that's a place where budget should be higher.
Anyways on to the bottom end, I cleaned up the conrods and got 3 that came out brown. It doesn't look like rust and it doesn't flake off or anything. I know nothing about the history of this engine so I'm not sure what I'm looking at.
Pictured is the one "normal color" one and the three brown ones...

They are copper plated to "bandaid" their use in a motor. I would not use them. What forging# and do they have bushed small ends? I may have some extras.