It’s possible that someone who drives a Mustang or Camaro just happens to be into cars, which is not a bad thing. It’s the same as someone who is into clothes, music, or any sort of commodity (Just a bit more expensive). Although, the Mustang is the typical “Look at me, I have a cool car, and I really want a Ferrari but can’t afford it, so I’m stuck with this” car. So maybe you should be a little wary. For the record, I am pretty into cars myself, and I can tell you that a Mustang is just an American muscle car that is complete rubbish (like most American cars). So if I were approached about a prospective shidduch for someone who drives a Mustang, I would ask why he has it over something else. I would not say “no” because of it. That would be shallow.
Oops, almost forgot to say where I am located: Not on the East coast.