Just set van weight to wheels on my 97 build. I used the CC880s springs as per instructions with my MG kit. Mine sits fairly high and has 50% tread on 31" tires. You can get an idea but if you want a measurement I'll grab one. Van is the standard 138" WB with the 5.4L. It has a raised top and some interior weight adding trim items, console, TV, high cabinets, so is not exactly light.
Raul had suggested to me that the CC880s may be a bit stiff as well, they were about 2" longer than my stock E150 coils as I recall. I have yet to test ride as I'm still mid build. I don't mind the height, looks great, but this van has always felt heavy on the road so hoping the stiffness may help with feel. I surely dont 'need' the height, but I would be concerned with diff to cross member clearance as stated. I trimmed out the I-beam mount only thus far but you can see the clearance attached here....I have about 2-2.5" before contact. More trim per the template coming.