You'll want to post this in the diesel forum.

The power/weight ratio of the 617 (pre-'86) 300SD is not great, plus the weight and size in the Kia will not make it a good candidate. The best IMO for this would be the 5-cylinder 602 turbo if it'll fit, or 4-cylinder 601 if the 602 won't fit.

For the size though, I'd be looking at a VW Tdi engine.

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