Rearend modification costs?

I have a 73 scamp that I am putting a 440 in. I need to change the 7 inch rear. Finding an 8 3/4 inch is hard around here. North Idaho. What would be the cost estimates for using a B body 8 3/4 housing and have it cut to size and new perches and axles. Someone has to have done this. Ford 8.8 inch rears are plentiful. What would it take to make one of those work? Any suggestions? Other options? I am just getting started on this so I will have many questions. Great site for answers.