I was a mechanic for over 24 years and back in my younger days we built a lot of jacked up 4x4 trucks and I owned several. I also have a friend who still collects old Dodge trucks. I even owned a 78 W100.
Dodge pickups were set up very similar to the Chevrolet 4x4. We even converted some to Chevrolet axles. The differential was on the passenger side and most had 203 transfer cases with full time four wheel drive. I've only ever seen one with a divorced transfer case and a lot of things had been changed on it before I saw it. That is not to say that there were not many more made, I just haven't seen them. The Dodge also had a small 5 lug wheel pattern, the same as the car until the late 70s or early 80s. There are pictures of a 79 Wrangler van on the internet. It has coil springs on the front with a Dana 44 as Brian said, with a steering set up very similar to the 78-79 Ford 4x4. From what I can see the suspension is similar to the Ford as well. The differential is on the drivers side just like the one pictured above. Notice also the small lug pattern on the van above without any lockouts. Most of these were full time four wheel drive with 203 new process transfer cases. In scale I don't think that there's enough difference between the 205 and the 203 to get too concerned over. The 203 was chain driven with shifting levers and rods to the case mounted floor shifter and the 205 was gear to gear with plunger shifters connected to the case mounted floor shifter. Most Ford front differentials had the pinion at the top with a reverse cut gear. The ones that I've seen with the pinion at the bottom had a longer front drive shaft and a divorced transfer case. Just from what I can see in the photo's I would have to agree with Brian that there's a good possibility that this one has a divorced transfer case. As Brian said the Firestone kit is a good starting point. Depending on how accurate you want to be, you could probably use all of the 4x4 parts from that kit. From what I remember the front differential is not that great in that kit, as already said any Dana 44 would work. I think the B.N.L. resin has a good Dana 44 too.
I did find some Dodge 4x4 vans on line that had leaf springs on the front, but they were all modified to some degree, but some may have had leaf springs from the factory as well like the pickups.