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Welcome! I can't help you on the '73 specific question but all Olds engines since the late 40's are called "Rocket" engines. It's a marketing thing. They do not share components with any other GM 350. In "olden times", Olds, Buick, Pontiac, Cadillac and Chevy each made their own motors. They were all GM, but they were very different.
C.J.
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