WHERE TO FIND AN ITALIAN COOKING CHOC, AT LEAST 70% PURE, AND INCLUDES HAZELNUTS?

Check with http://www.eataly.com/. I notice they don't mention the percent of cacao their chocolates contain, but there's a bitter chocolate bar with hazelnuts that's likely to be what you want. You can also phone or email eataly and get more specifics.

Can you share the recipe? That would make it easier to help you.