a body rearend question

I have a question that perhaps someone here can answer. I have an 8 3/4 in my dart with small bolt pattern. I also have an early b body 8 3/4 housing with axles. My question is- how difficult would it be to make the big bolt pattern axles fit my a body housing? Would it be as simple as getting the axles cut and the splines cut longer? This question has been flying around in my head for a while so I thought I would ask . Thanks!