If the car was built with the SS hood, it would have the open-element air cleaner #6423907. Chrome lid, black base. Should have a vent tube that connects to an elbow in the RH rocker cover. The tube is capped with a flame arrestor. There were a variety of AC212CW element styles used, depends on when the car was built.
Z/28s also used #6423907, at least for part of '69 production. The problem you may be encountering is GMPD once serviced it with a generic unit that was furnished with a selection of tubes and plugs to adapt it for many applications.
If the car was built with the ZL2 ducted hood, it would have the air cleaner assembly that sealed to the hood.
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