Wow, nice find! 🙄 Yep, it's valuable and ya really don't wanna touch it. Besides seriously decreasing its monetary value by refinishing or upgrading, you'd be destroying the history, the stories in the color and the dings.
If it's hard to get into this reverence for vintage thing, you could buy it and sell it to a vintage lover who will protect it. And you make a nice profit...I think it's worth about $1000 if it's 100% original...then use the profit to buy something closer to your taste.
Not many of these old Mustangs left in original condition...protect these axes.