Wow! In comparison to myself you seem to have the plans before the van. for me it was the other way around :-D
not sure how heavy your van will get and how soft it should ride in the end, but:
I had the general springs 43-1085 (9 leafs, 3460 lbs capacity) installed on my 2006 E-350. This lifted the whole rear up a bit and a 33" could perhaps work. It was fairly stiff for our more or less empty van.
I just took out 2 leafs each side last week to get a smoother ride until I have my new rear springs from Weldtec.
Depending on your plans and location (and capacity rating for a diesel) you can buy them in 2-4 (?!?) weeks here in the Bay Area. If interested, shoot me a PM.
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