66 valiant disk brake conversion??

Also, would an e-body rear end (with disk brake setup) fit under my 66 a-body valiant?

As is, the E Body rear end is too wide. I suppose the perches could be re-located to A Body width. Because of the overall width of the rear end, wheel backspacing would then be a problem. An A Body- specific rear end (such as an 8.25) would work much better if switching to LBP up front since the 8.25 is also LBP.