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For the Diesel on an E350 you want to go with the CC880S the 880 may be too soft. I would say that the E450 weight the same at front than the E350 with the same engine so I'll expect the similar results.
These guys seemed very knowledgeable regarding lifting with coil springs. They were also very reasonably priced. I talked with a guy named perry. All he needed was a part number for the stock springs in my crv to figure out a 2” lift that was guaranteed to be within a 1/4” of the desired height.
I haven’t ordered as I’m still exploring other options so no real world but they came highly recommended to me by a local spring company that only does leaf springs, also with a good reputation around here.