63 dart front hub install

If you "pressed" the original hub out of the drum, then probably at this age the studs were not still swaged; the drum could've been stuck on the hub. Clean up the replacement hub, especially around the machined edge of the center. Clean the drum too. It should fit together without a lot of effort. If it took a lot of force to seperate the orginal hub from the drum, especially if the studs were swaged, it's quite possible the drum got warped. You can check this by how true it runs when it's all assembled on the spindle; it should clear the backing plate and have zero wobble when being spun. Once a drum is removed, the swaging cut or studs forced out with a buck behind them, the drum should go back on without difficulty or a need to press.