big block A-body weight

i find it interesting that a few of you guys have them down to 3000lbs +or -. how did you do it? when a put mine together the 71 demon was 3710lbs. that was ever with a fiber glass hood, bumper and fenders. i then removed the "complete" interior except dash and center console, have one plastic race seat, and glass trunk and it still weighs 3505lbs. you guys have any ideas.