Late one night on a rural road in the western US, a policeman sets up a roadblock and begins stopping all traffic. When several cars and a big truck have stopped, he and the others learn the reason for this roadblock........

From IMDb: While driving through the desert, a teenage girl is frightened by a seven-foot giant which appears in her path. After escaping, she returns to the site with her boyfriend and her father in an attempt to find the giant. They do, and it proceeds to terrorize them and the rest of Palm Springs, California. Stars: Arch Hall Jr., Marilyn Manning, Richard Kiel, and Arch Hall Sr.

A doctor experimenting with transplant techniques keeps his girlfriend's head alive when she is decapitated in a car crash, then goes hunting for a new body. - IMDB Description

The Brain That Wouldn't Die - Full Version (1962) Dr. Bill Cortner has been performing experimental surgery on human guinea pigs without authorization and against the advice of his father, also a surgeon. When Bill's fiance Jan Compton is decapitated in an automobile accident, he manages to keep her brain alive. He now needs to find a new body for his bride-to-be and settles on Doris Powell, a glamor model with a facial disfigurement.