The Definition of "MuscleCar"

I would definately say most of the 60's cars were american muscle and the first year or two of the 70's. After that it was all junk until the 90's it started to get a little better. But that doesnt mean you cant make a muscle car from the 70's and 80's just junk the whole drive train and suspension and start over. But thats my opinion some people like no horsepower and lots of emissions but its not my thing.....