8 3/4 B-body rear

I have a 74 duster that was mini-tubbed and the springs moved under the frame,my question is, the 66 b-body 8 3/4 rear is 3'' wider than an A-body rear is it worth putting in the wider rear after having it mini-tubbed and the springs moved in to put big tires under it?
Thanks

This will all depend on rim choice. Only difference between this and an A rear is you will have to have 1.5 more inches of backspace. This will work great with todays mustang wheels that have a lot of backspace from the factory.I,d be willing to bet theres a butt load of rim choices for the stang that would work for you.