Can anyone educate me on differences in SS/AS and SS/AM

[sst7250]

Thanks so far for the info.I am familiar a little with SS and the Comp modified cars. I had a buddy who ran SS/AS that passed away and another who ran in Comp with a B/SMA car a few years ago and both cars always intrigued me. I have run .90 stuff and done ok and tried some TS racing but looking for a new challenge/direction. I was looking at a Cobalt and was thinking it would fit a few different classes. But I have very little knowledge of much of the SS stuff for sure. Any info is a plus for me. Also looking for a car if anyone knows anything nice out there.