Valiant weight

Are the 63-64 valiaints the lights a-body's built?? I have a 64 2d post valiant with a /6 ush button auto. Soon one day to be a v8. Heard anything from 2580 to 3100 lbs. Are these lightest a-body's the panels are like tin. Going to run two bucket seats all aluminum interior panels (no rear seat) frame conectors and cage (if needed), coilover conversion in front, 4 wheel disc, 360 auto...any weight ideas??