Chuck, the cap you have in the picture is not assembly line correct for a 1970 Z/28. The cap is a later style replacement cap that was used in 1973 production. They made several different versions of this cap. The one you have 2769047 with aluminum contacts, 2769047 R both with aluminum and copper contacts, and some had other letters like T and BH on top of the cap.
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1966 Corvette Coupe L79 Mossport Green
1969 Camaro Z/28 Hugger Orange
NCRS #22211
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