4 bar suspension

[v8ian]

Im in the middle of putting the rear suspension together a Austin a35 van, I was going down the route of de cambered leaf springs but I am going to struggle to get the van low enough without using lowering blocks too.
So the option of fitting a 4 bar has been looked at. I do have the luxury of a high floor and a flat vertical panel behind the seats which will be helpful for mounting brackets. I think I know how to align the bars, logic says parallel, but something says I need to pay attention to top bar and the theoretical intersection of the front axle to provide squat? under acceleration ?

[e321]

As some one who knows nothing about suspension design, I suppose its possible to design anything in, but I would have thought weight transfer will always provide some squat as long as the rear suspension isn't too stiff.