Can't find any reference to a GM casting number with the '8'.
Certainly early for a '69 model year part, but not surprised if castings were being made early to evaluate and ensure readiness for the changeover to the long style pump design.
FWIW, pretty sure that water pump was offered up in the classifieds here a few months ago.
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Tim in NSW, Australia
1969 Van Nuys 04A Z/28 from Clippinger Chevrolet.
Cortez Silver with dark blue interior.
Ran at Lions Dragstrip and Pomona Raceway, with paint by Bob Kovacs of Fresno.
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