When buying a muscle car, check for rust. A small rust bubble may be acceptable, but heavy areas of rust that require extensive work may not be cost efficient. Check for low mileage. Cars with lower mileage have greater investment value.
Compare recent sales of the same model and condition. Look for a make and model car that was not produced in mass quantities, as rarer cars are more valuable. Similarly, check for unique options that were not available on the original make and model. For example, power windows on a vintage Mustang are a standout feature that may be worth more money on resale. Original paint and original interior colors, especially in rare color combinations, are a better investment value. Muscle cars that have huge engines with a lot of horsepower, such as Camaros and Corvettes, are in greater demand and are better sellers.