I have a chance to get into a '97 E250 cargo van with a fresh rebuilt V6, or a '90 E450 step van with diesel & 5-speed. Either one is about $4k. Which would you choose?

I'm using an 80's Suburban right now, but its not working out so well for space and access. I used to despise the vans since I work on my own vehicles, but its looks like I don't have much choice anymore.