You live at elevation, Robert, iirc. Every time you drive you see how significantly air pressure affects engine power (except for turbo & supercharged engines, where the drop in performance is much less).
Climactic changes in air pressure are much less pronounced than those due to altitude, but probably enough to have a slight effect on power. The storm may have also cleared enough smog from the air that your car isn’t holding its nose. Oh, a 1966. It’s designed to inhale crud and like it.
I’ve read that station wagons of that era are a new area of collector interest, pure nostalgia for someone like me. Even though we only had Fords, I’d choose an Olds Vista Cruiser with the extra little windows for an improved view. I believe 1966 was the first year of the two-way doorgate tailgate that either folded down or swung to the side. We had just bought a 1965, but my father was so envious of those who had that feature. We had to wait until we got a '71.