Best way to remove moisture and mold in car?

Recently I went to check on my 67 barracuda. It is in a storage unit inside a storage facility. I noticed that there was some mold buildup and it was very musty smelling inside the car. I plan on going this weekend and starting the car up letting it run a while and taking it out in the sun to dry. Anyone have any suggestions on what can I put in the car during long boughts of storage to prevent humidity and mold. I did find something on line called Damprid which looks promising.