There is some info here:
Cummins C-180
In the early 1950s, Cummins did some research on the post-WW II Australian truck market that was then dominated by underpowered European diesel lorries and mainly petrol-powered North American trucks.
Blackwood Hodge was the service agent for Cummins Diesels and also did some repowering of petrol and other-brand diesel trucks, using the Cummins JBS, 150hp engine.
The larger Cummins HB600 – forerunner of the famous 14-litre, N-series – had less appeal, because it was heavy and expensive and there were no drivelines capable of handling its torque.
Linehaul was virtually unknown at that time, so the decision was made in 1961 to introduce the new C-series, a 464-cubic inch (7.6-litre) in-line six that had the Cummins PT fuel system and was offered at 160hp (naturally aspirated), 175hp (turbocharged) 180hp (supercharged) and 190hp (turbocharged).
History: Cummins engines Down Under - www.trucksales.com.au
The two stroke diesel would most likely be a 6-53 GM, they were fitted to the Dodge version (D5N) of the trucks like this one
dodge d5n 6v53 gm prime mover - Historic Commercial Vehicle Club of Australia Might be a bit big for your beast though, you might be able to fit a 4-53 GM but I'm not sure I'd bother and AFAIK they were never fitted to Dodge trucks.
Regards,
Tote
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