Having a 71 Challenger with a 440, auto and Dana 60 (Yeah its a heavy rear end but its what was in the car when I bought it in 1988...) with no heater box, wipers and the only lightweight parts is a lift off fiberglass 6 pack hood and 6 point cage in mild steel is still a heavy package. I still had the back seat and a pair of factory buckets and door panels. No creature comforts like a radio and light weight 10.5" A body discs and no power booster. The 440 had an aluminum intake and a big Holley carb.

I am definitely interested in how your build works out because I have appeared to make my car a fat pig compared your estimated weights. Not really sure where I went wrong. I know its not 3800# but I do know its not close to 3200 by a country mile. This video is from when the car had a 440 with heavy TRW pistons 6 pack rods and iron 915 heads from a long time ago...probably when some of you were still in diapers

But then again who am I just some dreamer that types away on Moparts...... :-)

http://www.youtube.com/watch?v=d94GGvS83es

The burnout at the 6:00 mark is one of my favorites.