Lots of Landcruisers out there with diesels. IH8MUD forum has a lot on the topic. A fair number of 4BT conversions have been done into LC's. Noisy and shaky seem to be common words to describe the results. I'd give some thought to an Isuzu or Fuso cabover 4 cyl diesel conversion into an LC.

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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