parts list for swap ?

The Durango pan might be fine in a van, but I don't know that for sure.
The vans steering assy might need specific clearance places that the Durango pan could interfere with.
My own experience tells me that vans usually have a crapload of clearance, and the motor is hung well above the steering.
Rear drive Vans also don't have a K member like what makes us change pans for fitting in the Mopar A bodies.

X2 on the specific intake for a carbed stock head Magnum because the intake bolts are straight up vertical instead of angled like the LA motors.
I have also not heard anything horrible about the Chinese air gap other than some porosity concerns, but no real proof of a problem.