3. Ford Mustang Boss 429
The Ford Mustang Boss 429 is a muscle car legend, produced in extremely limited numbers for NASCAR homologation. Its massive 429 cubic inch V8 engine was unique to this trim, setting it apart from any standard ’69 Mustang. Collectors treasure the Boss 429 for its rarity and brute power, driving its value well beyond that of the base model. According to Hemmings, pristine examples now command six-figure sums—making it one of the most coveted Mustangs ever built.