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Yep they do.... you don't need a aftermarket one unless your cam is not compatable with it.... and all the Comp Billet cams have a everwear gear that's compatable with the stock gear.
Since my oil pump drive had some miles on it, I replaced it with a new one from GM when I had the 383 built with the different cam. I also run the Meling HV oil pump and an ARP drive shaft.