The specifics of converting an E Body 8 3/4 rear end housing to an A body 8 3/4 rear end houseing

This has me nervous as i am a 3.5 back space going to have to cut the diff so i am super close to the offset leaf. Main issue with the duster is no point even trimming the quarter guard lip as the wheel well also dives in rather than straight up

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Yep, and the area of the outer wheelhouse that makes contact with the tire is very stiff and not easily "clearanced" with a big hammer . You can cut and modify the outer wheelhouse , but my car is already painted. In my case, I have a narrowing bar and pucks. If I ever get too annoyed by it , I have another housing I will cut.