Driving a car for extended period registered to another person in another state?

My Mom recently passed away and my father is making arrangements for me to drive her car. Since I am one of the 14 million that have been unemployed since October 2010 (declined for unemployment) I have no income to buy the car from him, or pay for the insurance. and must have a vehicle when I actually do get a job. (Too much info I'm sure). Anyway, my father has since had the car re-registered in his name in the state of Mississippi. I live in Missouri. The objective is for him to loan me the car for an extended period of time to drive in Missouri full-time. The vehicle will remain registered in his name and is insured by State Farm in the state of Mississippi. His SF agent told him he could add me as a driver to his policy. He carries full coverage. What are the implications of this scenario with regard to insurance and motor vehicle laws? Essentially, I will be driving a vehicle in a another state that is registered to someone else, in another state. You don't know what you don't know so I don't know where to start. Do I need to be compliant in both states? Or, just Missouri? I just want to make sure from an insurance standpoint I am covered for the worst case scenario and that if I were pulled over by an officer in Missouri I have the necessary paperwork to show them. Can anyone tell me what the red flags are in this situation and what I need to do to adequately protect myself, others in the event of an accident, and to be legal while driving in the State of Missouri? Many thanks in advance!