If that is the original paint it may clean up better than you think. The 3:23s are nice all-around gears. 318 mopars are nice engines and the Magnum version you have sounds good.
Nice. What are your plans for it? I would try cleaning the door panels. You should be able to get rid of the mold. There are cleaning products that are supposed to do that. I like the color combo. Good luck.