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Old 06-24-2019, 02:05 AM
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1967Z28 1967Z28 is offline
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It's from a '68 Camaro. The square hole holds the loop bracket that restrains the two heater hoses going from the heater core to the engine. The black area in the lower right of the picture is where the a-arm flap would be.

The holes may be for a NOx smog control box that used to get put on CA cars back in the '70s but those usually got mounted on the firewall.
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