78 trailering special

[Colesnsty68]

So I picked up this burb because it was cheap and I wanted a winter beater. I've never owned a 4wd square or anything other than pick ups so some of the stuff is kind of foreign to me. I was told it had a 400 but judging by the balancer and 2 freeze plugs I'm assuming it's a 350. It all looks close to original but I have my doubts. Anyways, it looks like it has a th350 and I assumed with the trailering special/ heavy duty trans it would be a 400. It's a full time 4wd if that changes anything. Does anyone else have one of these? It uses the radiator as a trans cooler and doesn't have separate unit like I thought same came with. Any info on the trailer info would be appreciated.