I'd go west, then north along the CT River, stop at the Fort at #4 reenactment. Here's the route, which includes 9 covered bridges.
https://www.onlyinyourstate.com/new-...-road-trip-nh/
It's about 70 miles plus time to the start and return to Alton.
I had three of those cars, 1969, 1987 and 1989. They're so much fun, it doesn't matter where you go.