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That is a 1974 number but that is a clam-shell which is late '70s early '80s. Pic of the internals will help id the engine, and I can't find a 70 HP listed for '74
That is a 1974, distributor. This is a link to a wiring diagram, it's for a 650/65 HP but same thing. Can't be sure of the HP of your motor as the decals and clam shell don't match the engine. 29.jpg (1424×1046) (maxrules.com)