What's your A body weigh?
I run small block iron head 360 and a 904 trans and yes still have the steel bumpers. Full 10 point cage and the hood and trunk lid has had the reinforcements all cut out its just the shell and pinned on. No interior just a fiberglass race seat. Frame has been tied in. It is pretty light looking at fiberglass now to try and lighten it up even more. I want to upgrade from 8 3/4 to a Dana so that will add some weight.