Hank's car

It's been awhile since I've seen the movie but it's definitely an MGA, though I believe it was slightly customized. The MGA was produced in Great Britain from around 1955-1962. I owned a 1958 model. I would have to watch the film again to see if I could determine the exact year.

Coincidentally, 1965's similar film, "The Beach Girls and the Monster" also featured an MGA being driven during the film's climactic(?) chase scene.