Think seriously about this.
Here's what I have spent from collecting parts: (I am picky and didn't screw w/ too much used sh*t)
A-Body housing (REAL, AUTHENTIC):........................ $500.00
Moser Alloy Axles (the good ones):............................$400.00
NOS 3.23 Gears (Never Used):...................................$220.00
Eaton Tru Trac:........................................................$545.00
489 Case:...............................................................$200.00
B-Body 11x2 Brakes (Refurb plates, new everything)...$335.00
Crush Sleeve Eliminator fronm Dr. Diff..........................$30.00
Yoke.......................................................................$120.00
I still need to spend $500 on labor/bearings/seals/etc.
Total will be around $2850. I love my car and staying true is important to me.
You can save big depending on where you live (parts demand/labor cost) and if you aren't super-concerned about anything failing.
I'm spending this money so I only spend it once.
In the end, even if you knock off $500 from what I have in mind, a complete B-Body rear could potentially be had for 1/10 the cost.
Dana would be close in cost. A 9 inch... well my dad could have got me a new unit through his company for $800, but you get the point. Call me stupid, it's okay. I regret nothing.