So what IS a muscle car?

Yeah, what the factory considered "muscle" car for the time period it was built. A factory HP package of some sort, usually starting with what was an upgraded engine and it worked it's way back. This would include the Early A 273 commando package, 340 cars, etc. However, to me now, it's just about any car made from 64-74 when the muscle war was truly on between the car companies. You can always add the bigger motor and such