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

yeah said
hey, thanks . I mess with fiberglass a little bit so the lip , rear spoiler , and the fenders flares and other things I built by hand in the garage lol . I do have some pics somewhere .

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