64 valiant weight

Just picked up a 64 valiant 2dr hardtop. Plan jane, /6 auto. Wondering how much this thing weighs. Planning on building a track car, any ideas. How much weight can I lose in by removing interior and adding fiberglass parts? Looking to run a 90's magnum 360 with fuel injection...have more parts than time...Any ideas for a setup or class to race in???