It should bolt in. You will need a different transmission, and maybe a custom driveshaft (or one from a 350SD, good luck finding that).

You could also drop your SD's engine in (your body is rusty right?)

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine