Well now, if your really up for a challenge...

How about cutting just the van frame rails where the front suspension bolts to, and attaching those rails to the 47's original frame? You could attach those tails to the original 47 frame in what ever manner you saw fit, and you could control the track width to some extent. You would probably need to eliminate the steering box and tie rod assembly and install some kind of steering rack. Depending on weather or not the 47 will actually be used as a work truck caring loads would make the difference on if the correct steer (front steer or rear steer) rack could come from a car or a truck. You would be able to use the van upper & lower control arms, the van spindles, and the disc brakes. That would allow you to use the van master, booster, and the proportioning valve, if you also used the van rear axle assembly.

An Intrepid is a front steer rack, and a Cavalier is the same rack in a rear steer configuration, and both are over 4,000 lbs cars, so if the 47 wasn't actually going to haul much, either would work. Both these racks have the inner tie rod connections at the center of the rack. One could make a custom built center link and then add the tie rod assemblies to complete the steering, might even be able to use the van tie rod assemblies if you eliminate the van center link and what ever holds it in position.
I would definitely be using the van motor & trans.

Food for thought. Gene