The 67 L88 I had a while back was stamped with an assembly date and the "IT" suffix.
I believe the 69 over the counter L88's were done that way also, if they were a whole engine.
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Rick
69 Chevelle SS396 Silver L78 M21 Post Sedan (Berger Chev.)
69 Chevelle SS396 Black L78 4-speed 4.10 Post Sedan
Don't text and drive.
Somebody's life may depend on it!