1st pic in the second post.
the same front end
Grab the sawzall........ and cut it off! 
I cut the 2 frame tubes that attach on the sides of the box flush with back of the box. I cut the vertical supports flush with the top of the box. Disconnect the steering first. Support the front end on a floor jack. it is gonna fall out in one piece.
You need to know how much you are going to lift it. I wanted 4" but , had to go 5" to get a good puchase with the steel plates I had on hand. Whatever you put on has got to be wide enough to but weld the cut off frame tubes to. The tube ends are your control point(s) as well.
PM me if I can help. Good luck.