If you are interested, call Northwest connecting rod in Seattle, WA.
They have done many a diesel vanagon to gas 2.0 engine conversion.  I
ran into a guy who has a westy for sale here in Seattle that they had
done a Passat engine transplant in his.  It looks like it was designed
to be there from the factory!  He's a poor grad student who said he was
'technically' selling his westy but hoped noone would buy it .  When the
engine goes out in my syncro I am going to have this done.  Good luck to
you!

Mike Garske