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Usually what cracks manifolds is retarded ignition timing .Then too if that truck had been used as a plow truck runnng under sustained loads can heat them up too . You get them real hot then shut the engine off before everything cools down by itself and eventually something gives out . A 454...

A 460 is a good old engine although they are real fond of gasoline . It was originally built for a Lincoln town car as a take off of the 429 . Last used in automobiles in 1978 . By the time that one ton was made it was strictly a medium truck engine .As such it should have hardened insert valve...