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Those are the steam holes Jerry is talking about, they have been plugged here. I tap my holes and stick an allen screw in there. I tap those big holes above the stud as well and have pipe plugs in...

Heres my 509 block, they have 2 freeze plugs instead of the normal 3. I guarantee this cost me a whole lot more to build than what is available nowadays.

Like others have said - .060 over is death for a 400. As far as splayed caps, you really need the '509' australian blocks with the thick webs. When align bore it is best to offset the bore to the...