Changing to BBP. Brake questions

I have a 68 d100 and a 70 here and they are both 8 3\4 rears I could get brake parts from. The wrecking yards where I'm at are closing. They are still towing and have cars in the yard but they're not selling parts. There is a yard only about a block from my house. They open at 8:00 and lose at 4-5:00 and I work 6:30 til 6-7:00. I have been watching here and eBay and market place looking for parts or even a car I could buy to get the parts from and sell off the rest but haven't found anything yet. Will all bbp swaps add track width? If so when I buy wheels I will need a different offset.