The Reincarnation of Peter Proud (1975)

When college professor, Peter Proud begins experiencing flashbacks of an earlier life, he's mysteriously drawn to a place he's never been to, but which seems familiar. He soon finds his previous incarnation's wife. This woman, Marcia Curtis, sees in Peter startling characteristics which he shares with her dead husband, Jeff. Even the sound of his voice seems at times to be that of the dead man.