1970 k10 frame questions

[4x4swb1970]

Someone plowed with my truck before I bought it so there's some tweaks in the frame. Its not out of diamond but I have a couple questions some of you may be able to answer.
First, I,d imagine where the front spring shackles mount behind the engine crossmember are supposed to be straight and not angled. Pic attached.
Second, my transmission, transfer case, and k member are all bolted on. Just wondering if that's original?
Third, I see the 4x4 body mount bushings are different than 2x4 just wondering if the 4x4 bushings are necessary.
Thanks in advance