Add lemon juice and 1/2 teaspoon zest to barbecue sauce; mix well.
Place chicken in baking pan, place 2 of the lemon halves and garlic cloves inside the cavity of the chicken, rub the outside of the chicken with remaining lemon halves and discard; tie the legs together using kitchen twine.
Bake for 1 hour 45 minutes or until chicken is cooked through. The internal temperature should be 165 degrees F, basting with the sauce mixture every 5 minutes during the last 20 minutes of baking.
Sprinkle with reserved lemon peel during the last 5 minutes.
Prepare the stuffing mix as directed on package, place stuffing in oven during last 30 minutes of chicken baking time.
Remove and discard lemon halves and garlic cloves from chicken cavity; skim fat from drippings in baking pan; serve drippings with chicken and stuffing.