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Problem with any spring change is that you have no idea what the final ride height will be until you've bought and installed it. The zero-rates, you know what you are getting, and if you can determine how much you want to raise it, you can tell if they will be the right height.
I did the add-a-leaf on very worn springs, IMO it made the rear ride rough. Did bring it up to about level though. Just recently threw on some fairly new 5 leaf aftermarket springs I got my hands on, and it rides much better, BUT the ride height is too much in the rear, by a bit. Could be due to the worn front springs, not really sure. One thing after another.
Just measure the distance from the tire to the wheel well in the center. You can get a good estimate of what you need. It's its more like a inch and a half I'd just get a 2 inch add a leaf lift. Still wont mess with anything and still use the stock shocks. May give you a slightly raked look but will settle a lil as you use them.