I dug out an old carb and manifold off of an early 70s Z. Not sure if the carb is an original match to the manifold. It is a Holley 600 with electric choke. The list # 6619-1 and below this is date code # 0976
The manifold casting # is 3959594. I think the assy came off 71 Z Not sure where to find the date code on the manifold. The car was sold in Canada, if that helps.

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Gas is for Heating!
Alcohol is for Drinking!
Nitro is for Drag Racing!

I'm not sure about the manifold, but the carb is not off any Z28. They came with a
780CFM, not a 600.

The manifold is correct for a 71 or 72 Z28.The date is located close to the distributor hole.

Somebody knows there Z's! So greg /you mean to say that 1971 and 1972 Z28 Camaros had 780 holley carbs?

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Gas is for Heating!
Alcohol is for Drinking!
Nitro is for Drag Racing!

For carb info, look in here http://www.nastyz28.com/camaro/z28lt1.html

Yes, all of the 70-72 Z28's had a 780 CFM carb from the factory. They all had a different List and P/N for each year and for either a A/T or M/T car. Starting in 73 they went to a Q-Jet with a cast iron intake.