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

i should've been more specific. generally $800 will buy a non rebuilt rear end, possibly needing some break work. $1200 range will normally buy a rebuilt rear end with or without a sure grip and rebuilt breaks….. what o you think about those prices? i can always rebuilt the breaks myself, but i am not familiar with working on rear ends so id have to take it to a shop or learn as i go.