Just a curiosity

I was just wondering, for all those chevelle fans to tell me what is the difference between a Chevelle and a chevelle SS? I am getting one with a 350, but i am trying to decide to put either a 454 or a 502? what yal think?

Emblems, Options package, and horsepower.

That's pretty much it. The options package is pretty varied though. Also Chevelle SS comes standard with a cowl induction hood on 70-72 years and the instrument cluster looks totally different.