[Vwdiesel] VW engine questions for max fuel economy

[Willard561]

I'm thinking of putting a Diesel engine in a Scirocco boddy along with a transaxel like the FN, FH or similar. I've noticed on person selling used VW engines doesn't like the 1.6 for this application and recomends the 1.9 IDI. On the other hand I know of 1 conversion like this that uses the 1.6 and the downer s happy. The owner has done a lot of VW diesel work, and is happy with his car, so I'm inclined to take the 1.9 recommendation with a grain of salt. What is the opinion of the people of this group?
Thanks,
Bill