Check that every hole on the replacement is completely open. If a cam lobe/rocker arm sliding surface starves for oil it will wipe the cam lobe in short order. May be worth installing it, put the valve cover on loosely and crank the engine with the fuel shutoff lever pressed then pull the cover to confirm oiling on all lobes.

Good luck!!!

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"Rudeness is a weak man's imitation of strength" - Eric Hoffer