Will an 8 3/4 rear end fit in a 73 dart sport?

Yeah that rear axle is just too wide for the car. They they rigged the front hangers and shackles. I wouldn't be havin any of it like that, but it's your car so you need to proceed how you want to. I would narrow that rear end to stock A body width like I did the 9" I am getting ready to put in my car......but of course then there's more expense involved. In the end, it would be more "correct".