Combine wafer crumbs, pecans, 1 cup of powdered sugar, cocoa powder, corn syrup, bourbon, and a pinch of salt in a large bowl. Add a pinch of salt. Stir until a soft dough comes together. If the dough looks too dry and crumbly, gradually add a little bit more bourbon (or some water) until it holds together. The dough shouldn’t be wet or sticky. Taste and season with a little bit more salt, if necessary. Cover and chill in the refrigerator for about 1 hour.