69SSZL1, given the fact that your car has so many similarities, how's about posting pics of your car and any documentation you have? What motor did yours have? How many options does your car have in common besides ZL2, Endura, fiber optics, etc. I wonder if they were ordered as a pair, with that much in common and such similar build dates. There's a story there. When did your car migrate out of WA state? Charley's rig stayed here its whole life, until he got it anyway. Now they're both in CA.....
South Tacoma Motor Company must have been the biggest Chevrolet dealer in Tacoma. The building is a sizable one, and currently houses a dealership/speed shop called Austin's Pro Max (owned by Walt's Radiator/Muffler founder Walt Austin and his dragster driving son Pat).