Is it a mild steel cage or a legal chromemoly cage?
Either way between 2800 to 3100 lbs. twocents
My chromemoly tube chassis 1970 Cuda with similar parts with thin steel replacement firewall and steel floor weighs 2750 lbs. with me in it at 260 lbs. driver race weight with a iron 400 block and Powerglide shruggy

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)