You need a reproduction owners manual for the glove box. I got mine from Omicron.
Even though I drive my Fulvia every week I still refer to it from time to time.
I do exercise the heater valve ( the lever Ed refered to ) every time I drive it, from my experience with other Italian cars it seems the valve is more likely to fail if its left off all summer than from regular use
87 Milano Platinum
76 Alfetta GT race car
70 Fulvia 1.3 Rally S
68 Fiat 850