Kissin' Cousins (1964)

"ELViS feudin' ELViS lovin' ELViS swingin' he joins his mountain kinfolk for a hey, hey, hayride to good ol' mountain music!"
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An Army officer returns to the Smoky Mountains and tries to convince his kinfolk to allow the Army to build a missile site on their land. Once he gets there, he discovers he has a look-alike cousin.