B body interchange question.

I would sell the Charger and take that and buy the RR or Bee you want for less $ and have $$ for parts/work. They sell somewhat cheaper. All B bodies from that era rusted out in rear, all of it, and the chargers are harder to do as the rear metal is 5 layers spot welded together! Prices for their parts are also stupid.
I admit I have owned 6-7 2nd gen chargers, but people have gone stupid over them. Pretty cars but...