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I remember the firing order being molded into the intake manifold. Not sure what year that was. I had a '57 Chevy, '69 Camaro, '71 Corvette. I'm pretty sure it was one or more of those.
They swapped two cylinders. I don't remember which ones. 5 & 7?
Small blocks and big blocks all had the same firing order till they came out with the LS motors in 97. LS is a whole different SBC.