1964 Dart Owner - In Over My Head

Different axle ratio with Clean Air Package: No, probably not. But with trailer tow package, probably yes. Build cards are nifty for determining what the factory put on...fifty-odd years ago. That doesn't matter as much as what's actually on (under) the car, which can be checked for certain this way. But even that won't matter til the owner of this particular '64 Dart is done doing the immediate repairs at the other end of the car.