I watched a movie back in 72-73 ? I was probably 6 or 8 years old. In the movie the hero was a man who drove a corvette in one scene, and he drove into his garage with the lights on. He used a shotgun and killed people. I think their eyes glowed and they had shrieks or screams like aliens or something ? I can't remember the movie enough to know what it is. I thought maybe James Caan was the actor in the movie but I haven't found it that way. Any Idea what it was ?

Could it be The Omega Man (1971)
(http://www.imdb.com/title/tt0067525/)Some of your description sort of match except for the car Mustang vs Corvette, Sub-machine gun vs Shotgun.