All 67-69 Z28 engines came with the windage tray & studs, and Z28 oil pan. I have taken apart many original 302 motors over the last 50 years and everyone had them. I worked in a machine shop in the early to late 70,s, and we specialized in Chevrolet HP .
FWIW - Original line installed windage trays are different than a lot you see for sale, they had a round hole for the dipstick instead of the elongated slot type opening.
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