Pontiac’s overhead-cam Firebird Sprint occupies a narrow but fascinating slice of muscle car history, combining a high-revving inline six with pony car styling at the height of the horsepower wars.

If the 2017 Chevrolet Camaro ZL1 and its 650 hp and 650 lb-ft of torque from the factory aren’t enough for you, take solace in knowing plenty of aftermarket companies will be glad to help you out. In ...