B-Body 8 3/4

I picked up a B-body 8 3/4, 54 incher with backing plates and breaks but no axles or 3rd member for 50 bucks at the monroe swapmeet.
All I would have to do to drop it in my 73 scamp would be change the U bolts and shock plate and spread the springs 1/4 inch on each side right?

How much would a good used set of big bolt pattern axles (if they came with bbp) cost, anyone got a set?