550-600HP 4spd suspension help

Does the houseing just sit in them brakets and the ladder bars control the twist by the look of it as iam not sure how them work but it looks like the still clamp to the springs and would still twist the springs just as if it was stock or is the houseing able to move? or am i wrong all together lol

ill add this to the above statment. see those 2 tubes on the left and that oblong piece of metal in between them and just up a tad, that what keeps the housing centered. after you get all the stuff bolted to your springs you sit the rear on it and bolt the top piece onto the rest, it's the piece just above the oblong piece of metal. now you center the rear in the body, measure real careful, put the tires on and remeasure to be sure you have good/same clearance on both sides,. now take that oblong piece and tack it in between the slider brackets at the top on the housing. remove the top bracket and finish welding it on. then install top bracket and set pinion angle.