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

No heater box, has everything else except back seat.
Functioning wipers , stock headliner, dash, door panels, hood, bumpers, glass, etc, and 15 gallon cell.with it full I am right at 3400, but it rarely is.
I am 330 ish
You're probably tired of the thing I used to say about you parking your dart in your house, but I still atleast once a month show my wife a picture and tell her " yeah it's in his house and his wife is totally fine with it".
She still says no !