Yeah sorry not 6.2 (been working on CUCV's too much lately). Yes they are 8.2L DD.
Prefair does have some basic parts, but unless you want something needing a lot of work I would look elsewhere. I was there when he took the trucks apart. He paid two guys with a set of torches to take the trucks apart and the vast majority of what he has left is junk (I have been in the yard many times). Expect any mounts/fittings/wiring/linkages to be ripped off or cut off with torches. For instance, pretty much all the cabs had their doors removed by flame cutting the bolts or hinges off. They could have taken 5 minutes with an impact but they used torches instead. He has some basic stuff (many busted up cabs, truck boxes, a few engines and trannys that were missing parts, and one or two winches) but most of it is junk. Saw a few hydraulic winches which had the hydraulic connections snapped off the cases which they were trying to sell for $800 each ($1500 for a winch that wasn't broken). He has some cabs and engine/tranny parts but the owner wants a fortune for the parts (we were quoted $1k for an engine and tranny that were missing parts and clearly needed a lot of work as well) so no thanks unless you are really desperate. He still has pallets of parts from the lots of iltis jeeps he took apart many years ago, but that is all junk too, but he wants a fortune for it as well (anyone seen his mountain of iltis fenders that has fallen over? He can't sell those either because he wants a fortune for them even though most are rusted now or have been badly damaged after the mountain fell over). He has said several times he does not care about the parts and would rather see them rust and scrapped then sold at another price. Is sad, but it is his stuff so he can do what he wants with it. So avoid unless you really need something badly from him and are willing to pay the high price. I buy any filters/seals/etc parts for the engine and tranny in our MLVW from the local DD dealer. Parts are still available and at reasonable prices. The other body parts can pretty much all be obtained from regular M35's for cheap.
Pic was taken in 2009. Was last there in the winter of 2011-2012 and the parts pile was looking a lot worse.
You can find the MLVW engines and trannys in trucks all over the country in the scrap yards for big trucks. The 8.2L's use to be very common at one point. The MT643 trannys are common in old school buses. Can't remember the name of the big scrap yard in Montreal that sells parts right now (brain fart), but we called them at one point and got many parts for the 8.2L from them for cheap.
Should have stated that they are no real complete engine/trannys setups you can find to try and transfer over into an M35 from an MLVW.