8 1/4 question

I plan on doing the same swap but not Dakota stuff.I got a 8 1/4 out of a 74 Dart with 2.45's. An Auburn with 3.55's was what I had in mind. I called Randy's and got a price of $800 for everything needed to do the job. I was thinking that I could get a A-Body 8 3/4 and but Moser axles for $800. Then again you wouldn't know what condition the gears would be in.
AHH well I'm NOT anywhere able to do either right now anyway.