Chevrolet’s first personal luxury car could be ordered with the same 454 big-block it was selling to Chevelle buyers, rated at 360 horsepower and 500 lb-ft of torque. Just 3,823 people checked the box in 1970, and the badges were small enough that almost nobody noticed. Here is why the Monte Carlo SS 454 remains the most convincing sleeper Chevrolet ever built on purpose.