Connecting Rod Color?

Hey everyone,
I purchased a 318 a few days ago and got it torn down. The motor ended up having a spun main bearing. Well, I just cleaned the rods up today and one of them has a way different coloration then the rest, it's a kind of bronze/copper color...see pic.
Anyone got any ideas??

Oh yeah, does anyone have the link that shows the oil passage modifications you can do to the smallblock to help oil everything better? I saw it on here once before, I think a member posted them sometime. Can't find it.