These aftermarket springs are a pretty inexact science. I bought another one for my fenderless small block powered '32 5-window - just the opposite: sat real low, bottomed out on most big bumps, plain dangerous! I had a leaf added, made all the difference in the world! I've put 35,000 miles on this car since, much better control, actually rides nicer. Our buddies in China don't have the slightest idea what these things are that they are making - good, bad, or indifferent, we keep buying this stuff. Spring shops are a thing of the past. In the old days we would have our springs reworked, reverse the eyes, retemper them - add or remove leaves till we got it just right. The shop that added the leaf to my 32 spring doesn't do that anymore - they just sell new springs. We have become a 1-800 society!!
I'm sure Kube knows alot about old Fords - so do a lot of people. Most are smart enough not to state an opinion about something like this spring unless they saw the old one in the car and the new one that replaced it!