Opened up an old 400 - what is this???

Why in the fuckin' **** would you stamp the cylinder numbers on the block? That's the stupidest thing I ever heard and I bet this block was a fluffer at a trade school so the dope smoking kids wouldn't spend all day making ninja stars and ****.

I would deck that off if you're going to use anything other composite head gaskets. At the very least, stone those number stamps flat.