I think you will need to get the state to send you a title for the car showing you own it. I would call the secretary of state and ask them how to do this. My guess is you will probably have to show you inherited the car, either with the will, or with some sort of documentation for how the estate was executed if there was no will.
I can't answer that unfortunately as I'm just a customer but I'm sure they can help you out at the counter... My advice is to get there as soon as or shortly after they open as to avoid waiting any longer than necessary.
Thanks! Your answer is awaiting moderation.