If my memory is correct we lost just shy of 100 lbs changing over the front and rear bumpers to glass and utilizing 1/8 thick aluminum for brackets.
My 64 Dodge Polara 500 started out weighing 4200 lbs (with me 225) about 6 years ago. It lost 115 lbs just removing the bucket seats and center console.
Current weight is 3550lbs (with me, now 235), bumpers and hood are glass, aluminum bumper brackets, lexan windshield and side windows. Chrome moly ladder bar set up, 10 point chrome moly cage with additional structure bars including funny car head restraint. KB block running a Dana, under the dash is gutted too. I know I could remove more weight by cutting but I like it being all steel with the chrome trim