I just put a 2.1 (Digifant) in my '85 (Digijet).  The conversion was
remarkably easy, once I spent a week alone with the Bentley.  I had both an
'87 car and the '85, so I moved the appropriate plumbing for the engine
cooling from the '87 to the '85 vehicle.  I did this so I could keep the new
waterpump on the 2.1 and use the newer hoses, etc. that had purchased before
the conversion.  I kept the Digijet FI system, which required that I move a
few pieces off of the 1.9 engine over to the 2.1.  Let me know if you need
more information.

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