By accident I was directed to this Italian forum, which has this large thread on the Italian saloon car series (CIVT) 1987-1999.
http://www.motorforum.it/cronoforum/...=asc&start=800
Two 635s from the opening 1990 round held at Monza
#3 Gianni Giudici
#6 Marcello Gunella
The Giudici car bear clearly signs of being a 1984 Eggenberger car and a bit of an odd one out for Giudici, when looking at the other cars he usually raced, i.e. newly discarded factory cars.
I can't link directly to any particular post or picture, so scroll up and down a bit.
Jesper