7 1/4 to 8 3/4 rear end swap info needed

I am considering switching over to an 8 3/4 rear end in the near future. First, i want to make an informed decision. i have a '71 dodge dart with a 318/727/7.25 rear end setup. I want to know if i will have to swap out my rear wheels when I do this conversion to 8.75 rear end? the reason i think i may have to is because typically i have seen larger bolt patterns on the 8.75 rear ends unless i am mistaken(which is entirely possible).

Right now i have front discs and rear drum brakes with 19" boyd cottington wheels. I am only putting this out there because even though i will probably go for the 8.75 swap either way, i need to budget out for other costs for example shortening my driveshaft, getting a new set of wheels and tires ect. I am looking for an A-body 8.75 rear end with sure grip for less modifications and proper fit to my needs. Any info and help is always appreciated.