Concern over whether roast chicken is safe
The only way to know if your chicken is safe to eat is to measure its temperature.  You should check the breast (165F/74C) and the thigh (can go higher than breast), ensuring your are measuring at the center and not touching bone.  Stuffing is usually not a good idea, because it increases the cooking time, and will likely result in overcooked white meat or under cooked items in the cavity.  Invest in a good thermometer and learn how to use it correctly, you will feel more comfortable and produce better meals.