The 6.2L diesel might be the obvious choice, but if you don't mind it being even more underpowered, try a VW 1.9L TDI engine. My friend and I towed a 1999 Forester with his 2002 Jetta TDI. The total weight must've been close to 7000 lbs. The TDI (stock other than nozzles) pulled the weight just fine. Hills were a bit slow. With the reduction in drivetrain weight, the Caprice/Roadmaster won't weight much more than a Jetta or Passat.
Other options are the Cummins 4BT and Mercedes OM617a.
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2000 Honda Insight
2000 Honda Insight
2000 Honda Insight
2006 Honda Insight (parts car)
1988 Honda CRXFi
1994 Geo Metro
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