Should I ladder bar or 4 link

If you look at the bad picture I posted you can see the housing ladder bar mounts with a 4 link style mount on the housing. In my mind i am thinking you could change the instant center height with this, just not the instant center length. I will be back over working on my cat this weekend and I will measure the length of the ladder bars and get some better pictures. I think I might order that chassis book you have as well, it sounds like a great read. Most of my chassis knowledge comes from circle track.