Peter, don’t worry about the purists – I am sure a Fulvia with fuel injection is a fine thing. I think we have had posts on the forum about this before. Two names that come to mind who have experience of this are Paul Leclerq and Justin Hildreth. The only link I can find is this account by Paul that includes some details of his Lucas based system:
http://www.lucasinjection.com/lancia_fulvia.htm . Paul's car went very well. Let us know how you get on.
Colin