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

Got the 9 inch out. Found a local shop that will rebuild it. The owner before us moved the leaf springs and the shackles, so that the rear end would fit. My only question is, was there a reason he didn’t just move the bracket that mounts the leaf springs to the dif? That seems that it would be a lot easier.

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