You realize you picked the widest car rearend to put in your Duster...I'd sell the housing and axles to an E body nut, which would go a long way towards buying an A body rear, or paying to have another one narrowed. I say this because E body rears are sort of rare, while B, C body or truck housings are pretty common. An E body rear might be worth some decent money to an E body restorer. just a thought!
Looks like you have made pretty good progress on the disassembly, keep up the good work.
Alan