67 mustang, no power steering or air conditioning, 6800 dollars, what should i do?
It all depends on your priorities.
The 67 mustang is a classic and will hold it's value if not go up.
If the car is original and you put in aftermarket air, the value goes down.
This is an older car and there will always be something going wrong with it and unless you can tinker (or have a dad, bf or brother who can tinker and fix the little things for you), it will two bit you to death.
I suggest you find something else in good condition that already has air, like a honda civic . . .something good on gas. Once you're older and have more money, buy that classic car.