[MagicRat]

I'm afraid you are a bit below the price range of any of the true muscle cars; GTO's, V8 Chevelles etc, at least ones that are in decent driveable condition.
However, a '70's Camaro/Firebird is possible, as is a V8 Duster or other '70's mid size coupes.

Also, consider a '60's or early '70's personal luxury car, like a Thunderbird, Monte Carlo or Grand Prix. They all had decent muscle car worthy drivelines and often rode on the same or similar basic chassis and suspension, but are cheaper to buy.