"Pictures of similar plugs at http://www.1970z28camaro.com/engine/ along with pictures of carb stamps."
Yup, very well known site and that car remains a benchmark for Van Nuys built 70 Zs. But, it is a TH400 car, so the carb is different than the 4555 4-speed Holley along with the stamps.
"I wonder if the NCRS-Corvette guys know?"
I still need to check with a friend that has some very good connections in the NCRS...thanks for the reminder 
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Steve Nuwer
1970 Z28, Norwood 03A, 48 48, 723 Int, M20, COO, 2021 Legends Platinum restored
1970 L78, Norwood 04C, 17 17, 711 Int, M21, COO, born-with drivetrain project.
1972 Z28, Norwood 11C project, born-with drivetrain, 26 26, 775, M20, CGG project
1970 Z28, Norwood 05C, 48 G, 720 Int, M21, COZ, Original Unrestored (SOLD)
www.2ndGenZ.com
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