73-76 Sway bar?

Thanks so much guys, it's definitely from a later a body. Would there be any need to upgrade to a larger bar? This Duster is going to be a cruiser but there's a lot of curvy roads in SE Ky. I have the big block T-bars and rebuilt stock suspension. This sway bar looks interesting. Would it be overkill?

http://www.summitracing.com/parts/hel-55905