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Just put some 5"trail gear springs on my 1984 frame, I want to see the the proper angle for the shackle to be at on the rear springs. I moved the front hanger 6" forward and the shackle hanger 2"to the rear.
I would wait to fully weld that rear shackle mount until you have the full weight of the bed, tank etc sitting on the springs.
Just tack for now, adjust later.