Welcome. Whatever weight you strip out will be replaced by a cage anyway, so partially dependent on the weight of the cage.
We have 2 x full spec'd out 350z, caged race cars in NZ. One is space framed, (eek he can't crash it again, it will be replacment time, lol), supercharged with basically most of the Stillen shop attached to it performance wise. The other 350 is TT'd, small turbo's, but they spool brutally quickly, and he's running Cusco suspension.
If you like I can inquire with both of them how much weight was removed. One has had basically everything that was unnecessary stripped out, the other still has a couple of creature comforts.