How much weight gain from adding a Dana and roll cage.

With my 330 in it and about 8 gallons of fuel( have a 15 gallon cell) it was 3360.
8 point MS cage, pro car seats, full carpet, headliner, door panels, dash etc, etc.
factory hood, bumpers, glass, etc.
Okay, that's good to hear. 12 point cage & actually 14 now, will be adding a few more bars. No interior besides the dash and a kirkey seat. Very narrow d60, split mono with assassin bars.
Strange front brakes, tunnel ram 470, 727 with some billet steel stuff, light wheels.
I will not be using factory glass again front and back because I don't want to buy new seals and mess with that hassle lol.