In my 78 wagon I don't use the QA1 springs but I do use the air bags in stock springs and they raise the rear about 2 inches at 20 lbs, but the rear gets really stiff (the air bags are really for spring rate control instead of lift). This is what I want in my drag car on the right side, but would be rough in a street car. They fit tight in the stock springs and I don't think would fit in the QA1 springs.
Somewhere in the site is a chart for what springs to use in each car type. You could probably find one of the QA1 springs with the load rate and height that you need.
Hope this helps some. Rob