1974 Dart 440 tuning help

Your cruise afr is ok, could possibly be a little leaner, but it’s ok for now so don’t change the main jet. Plug the secondary power valve, and go up about 12 sizes on the secondary jets. That’s where I’d start tuning it. Measure your vacuum at light throttle cruise and cut it in half, use that to select your power valve in the primary as a start.