How much weight can you shave off of an A-Body...and still have it look/drive like an A-Body?

I'd like to see the spoiler too. I've always wondered if I could make stuff like that. I kind of doubt it.

To tell you the truth I don't know what I'm doing 95% of the time lol . So I believe you could do stuff like that . Because if I figured it out you can . Just got to learn by making mistakes . But yeah I'll dig up some pics . Pm me thou because I'm gonna forget