327 cylinder head markings

[mcarlo86]

The 327 I have in my ‘68 C10 came originally out of a ‘68 C50. Dad and I rebuilt this engine back around ‘01-02 while I was in college. I was looking at the markings on the heads and was curious if anyone knows what these heads are? I do plan to pull the valve covers to reseal them and I can get casting numbers then.

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[Sad Sack]

Maybe:

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[bucket]

I used to have a "Chevrolet By the Numbers" book that was really useful for stuff like this. Got lost in a move though.