rear brake drum adjustment clearence drag ? problem ? 74 valiant

Hard to tell in the pic if this is brake dust from the center of the shoe gathered at the ends (means only touching the drum in the center of the shoe) or if it's ONLY touching at the ends causing wear marks on the ends.
But you can see how the surface of the shoe is different at the ends (which on new shoes it's usually the center not contacting the drum until the ends wear down.
That uneven surface contact from one corner of your car to another can make a car with new shoes pull to one side, because there is less friction on one brake than the other.
I would sand the drum and let that take some of the high spots on the shoes off, but left alone it would also probably straighten itself out in a couple of hundred miles. (High spots wear down a lot faster than the full flat surface of the shoe)

Since you are one a time limit on leaving for your trip just leave it and go.
(If that is your only concern) they look fine.

shoe 2.JPG