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and wasnt it the datsun in line 6 that got sold to everybody that wanted one---based off the 240Z block...



Nope. International used the Nissan SD33 and SD33T (turbo version) in the Scout in the late 70's until end of Scout production in 1980. Some of the early Scout Diesels apparently had Nissan and Chrysler logos cast or stamped into the valve covers because Chrysler Industrial was the importer and distributor of Nissan industrial engines at early production. Later Scout Diesels didn't have the Chrysler logo.

Chrysler used the Mitsubishi 6dR5 engines in the late 70's until '85 or '86 in the D150 as an economy option. It was in no way a tow engine like the later Cummins 6BT.

Chrysler also offered a Mitsubishi 4d55 and 4D55T in the D5, which in itself was a rebadged Mitsu offering. The same 4 cylinder Mitsu Diesels were also offered in the Ford Ranger.