Here is an example of casting numbers: D4AE 6015 AA. C=60's, D=70's, E=80's, F=90's. 4=74, A=full size car, E= engine plant, 6015=basic casting number # for 8cyl. engine blocks, AA=revisions. I couldn't find my book, I must have loaned it out and forgot about it. But your casting number should be something like the above example. All this is off the top of my head, so don't hold it against me. As for the heads, got me. I can't remember anything to point you in the right direction.
Oh yeah, the 6F26 is June 26, 19?6. I know this probably isn't much help, but it is a start.
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