The other thing you need to be aware of is that the intake manifolds on the 617's in the vans are not the same as the intake manifolds on 617's in cars. (I think). So you would need to source a van 617 intake manifold. Valve covers are different also, with a different oil fill. Also a turbo on the 84 is not going to fit inside the doghouse on the van. The OE 617's in the vans were NA, not turbo.

__________________
1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13