Few other things that could hint at 1969 rather than 1968 - the curved headrest posts (as you spotted), A, B or C suffix to trans stamp if a Muncie 4-Spd, block casting number (a 350 that late would be a 3970010 block) if original to car, other dated components like alternator, VR, distributor etc. Wheel codes might also be a clue. But not much to go off if you can't see it up close!
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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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