Don't have any numbers to help but I did the following to my Cutlass.
Fiberglass bumpers (front& rear), custom aluminum bumper brackets, Aluminum core support, Aluminum radiator,fiberglass cowl hood.
Some weight was added Pontiac 440, th400, 12 bolt and rollbar.
The car ended up 3250# race weight, 225# of that is me.
I also used an Iceman trans crossmember 8#, awesome piece.
He also sell a core/radiator support. In the future I might swap the aluminum one onto my wagon and add his.
78 Olds Cutlass Drag car PONTIAC powered with 440 (destroked 455), th400, 12bolt with spool 4.10z Best to date email@example.com mph at 3250#
79 Grand Prix, will be new home for the 440 Goal "street Legal" 9.75z@135mph at 2900#
83 Malibu Wagon Crate 350, Custom T5, 8.5 with Auburn posi 3.73z Making it the Ultimate Utility VehicleGo, tow and show (not so much show, yet)