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

I should also add that I removed the window mechanisms for the rear windows and drilled a bunch of holes in the doors and behind the panels...it currently is sitting as a roller but will be going back together this winter with a bunch of parts that came off my 68 valiant...1.14 torsion bars, borgeson box, Viking shocks ect...and the part everyone will hate... a 340 inch all aluminum 5.3 chevy that was for a truck project that went in a different direction...I could post 4 corner weights as the build goes if you are interested bjkadron