8 3/4 swap on 69 dart

would like to put an 8 3/4 rear in a 69 dart. Looking for advice or tips on what all problems people ran into or things to look for. Is there many or any modifications? Thanks guys

Do you plan on going with big bolt pattern? If so, you will need backing plates and brakes off big bolt car, also axles, Dr Diff is a great place to get all that stuff, or they are available on here from time to time