Donny, if you cook the pork to 180 degrees the issue will not be of safety. As Bill mentioned above, you can cook pork up to around 150 without risking your health.
Texture wise it will be different. More than likely at 180 degrees you will have sliced pork, not pulled. Temps. typically above 190 will give you pulled pork, however do not be dependent on the temperature but rather feel. One way I check if the pork is finished is by pulling on the bone. If it comes out pretty easily you know it's finished.
Erik