8 3/4 for 73 dart swinger

You know if you find and A body one, it will be a small bolt pattern.
I can't say a cheap way to do it.
Get a B body and shorten everything? I don't think that would be really cheep.
I venture to say most people get the housing and put Moser axles in it with back spacing for the wider (modern 2 1/4?) brake shoes and a big bolt pattern.