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.
That's an almost perfect description of my 62 savoy. Around 3250 without me, and I'm 200 or so. (191 this morning, more after lunch, lol)