Preheat oven to 350 degrees F (175 degrees C). Spread 1 cup chocolate chips and 1 cup pecan halves into the bottom of each pie shell.
Whisk dark corn syrup and eggs together in a bowl. Add sugar, butter, and vanilla extract to corn syrup mixture and whisk until smooth. Stir in coffee-flavored liqueur and chocolate syrup until pie filling is well-mixed. Pour filling into each prepared pie shell, being careful not to disturb the pecans and chocolate chips.
Bake pies in the preheated oven until crust is lightly browned and filling is puffy set, 50 to 60 minutes. Cool on a wire rack.