Phil, I thought I would let you know the ZL2 hood was not available for 67's or 68's, but there's a poop load with them.
Per: CRG
Cowl hood (ZL2): The cowl hood was an option on SS and Z28 models in 1969 and was included on all COPO's and Pace Cars. It was introduced midyear 69 and the first known Camaro to have one from the factory was the #1 ZL1, built 12E. No documented cowl hood car before 12E has been found. The ZL2 option included a solenoid and flapper in the hood. The wiring for the solenoid was routed thru a special hole in firewall above the fuseblock. Only 10,026 cars received cowl hoods in 69 and about half of those went to COPO's and Pace Cars, meaning there were only 5,000 Z28's and SS's (out of about 20,000 Z28's and 30,000 non-Pacer SS's) that received the cowl hood.