That's in great shape!
What are you going to need to get it running?
Tune-up stuff should be pretty easy, and fluids are normal.
Brake stuff may take a bit longer, but fairly easy to find. Check the links I posted.
Find out how long it's been sitting; you want to wake it up without causing any damage. If you have to drop the gas tank to clean it, it's better than filling it first. You also don't want to loosen up all the junk in the lines just to push it into the carb. There is a water distribution tube that goes inside the block's coolant passages. Better to check it before you get it hot. It would probably be a good idea to prelube it and rotate it by hand with fresh oil before just hitting the starter.
Another issue with the older cars mentioned on the P-15 site is wiring. There is only one fuse for the whole car (headlight circuit). Better to inspect all the wiring before installing that new 6V battery. This is also a 6 volt positive ground vehicle, so don't go jumping it with a 12V negative ground car, unless you follow the instructions very carefully. Good luck waking the slumbering Mopar!