Anchovy Pasta with Garlic Breadcrumbs

Name: Anchovy Pasta with Garlic Breadcrumbs
Ingredients: 8 garlic cloves, divided; 5 ounces sourdough or other crusty bread, crust removed, cut into 1-inch pieces (about 2 cups); 1 teaspoon finely grated lemon zest; Kosher salt, freshly ground pepper; ¼ cup plus 3 tablespoons (or more) olive oil; 4 oil-packed anchovy fillets; 4 oil-packed Calabrian chiles, very finely chopped, or ½ teaspoon crushed red pepper flakes; 1 tablespoon (or more) fresh lemon juice; 12 ounces bucatini, spaghetti, or linguine; 2 ounces finely grated Pecorino; ½ cup finely chopped parsley; 2 tablespoons unsalted butter