Well, had to know if stamp you mentioned was on intake. Nope, no stamp, just casting date 5/12/69 and # C9ZE9424-E.
Although whoever installed motor (whether factory or after delivery) did a hack job to make pass exh man fit thru new frame, they did a great job modifying this Goose with a tubular frame that is lower than the standard 302 frame to accommodate the wider Boss motor. Picture not so good but gives an idea how frame was modified.
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