I know the question is four years old I'm not sure anyone answered the question about a version of the 569 manifold with numbers cast on the runners, but the answer is "Yes, there are manifolds like that." I have one on one of our cars. I believe it is a later, over the counter piece but I did not take the splash guard off to verify the date before we installed it on a 1971 CE engine.
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Happiness is having Chevelles, Novas, and Mustangs in the garage, and a wife that is OK with it all!
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