Triangulated 4 link question

It's basically a street car that may go to the drag strip once in a while. I know parallel would be ideal but its a street car and I don't want to loose the back seat. As you know these A bodies are so tight under the there I am struggling where to position the top bars. The lower bars are going where the leaf spring perches are in line with the frame since it is mini tubed. I don't see how I can put the top bars to the frame since that is where the brake lines, fuel lines, E-Brake cables etc... are. The real reason I am doing this is to fix a problem from when the mini tub was done and leaf spring relo was done. The rear end is not sitting square to the frame. I have confirmed the "frame"/ body is square so I am not sure if the issue is in the perches or the axle mounting points. If I am going to tear it all out and fix it correctly I can't see doing all the work just for leaf springs.
what car are you putting this in? I'm running a 4 link parallel in my dart and didn't lose the rear seat. Normally with 4 link parallel's, that is not a concern. Its when you go with the 3 link setups that becomes a concern.