http://www.youtube.com/watch?v=-JucIH7qX00
While this 1978 Dodge Power Wagon pickup-with-the-Cummins actually began life with a gas engine (the 360 V8, to be exact), I'm wondering if, out of all the MY78-79 PWs that were specified with the Mitsubishi 6DR5 (CI655-100 in Chrysler circles) normally-aspirated diesel engine, were repowered by the Cummins (Dodge-spec) engines from 1989-98 (with the original 12-valve head) or 1998.5-2002 (ISB, with 24-valve head)?
Since the 24-valve version of the Cummins 5.9 engine (renamed ISB) didn't appear until mid-1998, I'm guessing any repower attempts on the 1978-79 Dodge diesel PW pickups (those that appropriately say "DIESEL POWER" on the front fenders) would have encompassed the 12-valve version used from 1989-early '98, since the majority of these diesel PWs didn't really last very long overall.
Also, while the 4.0L Mitsu mill was used on the D/W100 and D/W200 series Power Wagons, the Cummins engines used since 1989 were restricted to the D/W250(0) (only those with a higher GVW rating) and the D/W350(0) series (Ford used a similar practice of offering the Navistar-built 6.9L and 7.3L only on F250 models with the higher GVW rating, and all F350s).
~Ben