Looking through my photos this is a shot of Mark M's 70 Z28 which was 98% original when I got it and this was stamped on the intake. I blew it up and cannot really make out for sure what it was. An "A" or backwards "4" based on when I blew up the photo. The engine assembly date was 3/11/70 so maybe it is an A? This stamp looks much larger than yours however.
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