price to narrow a B body 8 1/4 rear

I do that sort of work in my shop. The cost If you determine how much you want removed from each side and the housing is clean... really clean. is $150.00 the cost to disassemble, clean and establish width/pinion center-line is extra. axles vary in cost and you can get them as easy as I can from Dutchman, (my first choice) Strange Engineering or Mossier but because of some really bad experiences with Mossier I'd stay way away from them.
I hope this helps

drdan