B body 8 3/4 into a body

I'm looking to build my reared in my 72 demon aftermarket axles full spool bearings, everything. Well there is one for sale but its out of a 66 cornet. Also plan to relocate the leaf springs as well at the same time. My question is will this rearend go into my car without major problems? I have a set of 17/8 bullets from a Ford mustang. Any help you all can give me would be great. Thanks Aj.