How much was a 1957 Chevy cameo in 1957?

Depends on many factors. Condition, model, engine, etc.

if its in good shape, no rust then about $5000 if its all rusty and messed up about $500 at most. also if it runs or not

There were 1.5 million Chevys built in 1957 and only 1,530 had the Fuel Injection option. The F.I. was a $484 option. That was allot to pay for an option on a car that cost around $2,500.

It depends upon the aspiration. The dual carb setup, (the fullhouse) made about 285. The F.I. model, was closer to 290. Single 4 barrel, about 260. and with a 2 barrel, I think around 225.

No, the 1957 Chevy didn't come with seat belts.