Depending on what the new engine is out of, the oil pan may or may not be correct for your chassis; but otherwise it'll be fine. Just check to see if the pan is front, center, or rear sump and whether it matches what's in your van- I'm not really up on which one the van uses. At worst you'll need a different pan, pickup, and dipstick.
On the off chance that your van is a stick shift, make sure the new crank flange is drilled for a pilot bushing.