8 3/4 B to A swap

I have an 8 3/4 rear end out of a '73 satellite that i want to use in my dart and i was wondering about the costs and transfers involved in such.

How much do i have to shorten the rear end? how much is it going to cost? where do i have to relocate the spring mounts? Will i have to change other stuff, like the driveshaft and the parking brake cables?

And finally, does anyone know anybody in the boise (or southern idaho) area that has the equipment to do this? nobody i know has needed to do this, so i have no leads at all.