I think that is the Impala / Chevelle duct. The 67-68 Camaro Z28 cowl plenum duct laps up onto the top of the firewall (top set of screws go down into the top edge of the firewall). However, I don't know if the cross ram duct was different in that regard.
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Jeff Helms
65 Z16 Survivor
65 Z16 drag car
66 Chevelle L78 unrestored
67 Chevelle L78 unrestored
67 Camaro SS350 Survivor
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