I'm still thinking a 56 or 57 Pontiac or Olds 4 door. Look at the picture closely. You can see the line of the back of the rear door. It may be a 58 Pontiac because GM made changes in 1958 to their body styles and I'm not sure if that included Pontiac. Oldsmobile definitely like Chevy and Buick and Cadillac made changes. If we saw more of the front end, I could definitely identify the year and make. Either way, I'm pretty sure its pre-58 unless it's a Pontiac. Not sure about that make.