1965 273 Head Gasket Question

Funny, I don't remember if I ever checked that out when I rebuilt my 273 over 10 years ago.

These are the head gaskets I pulled back then, and they do have all of the holes.
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Couldn't find anything related to the part number. I did use the thinnest metal head gaskets I could find from flatlander racing. They were also Victor rather than Felpro blue. FP were about twice as thick as the metal ones.
I'll look into these gaskets and see what I can find, thank you. The gaskets I pulled look like the felpros I was planning to use but I don't really know that much about the history of this engine other than it was leaking oil from valve covers and oil filter housing gasket but was claimed to be running when removed and replaced for a built 318.

From what I can tell I see no signs that coolant ever got anywhere it wasn't intended to.