There are pretty much two paths you can take here: Either use taller leaf springs, a transfer case, and a driven front axle to "convert" the van, or treat the van like a body only and set it on the chassis of something else. I took the second path and I'm still working on it. Pretty happy with the way it looks but have a notion that the first way might have been easier. Do you have a thought on which way you're leaning?
My van is a '67 chevy 90" and the donor chassis was an '87 chevy 4x4.