Within this range, the wheel moves but the tires don't. Call it slop, free play or whatever, every Mopar steering box has it whether it has been rebuilt or not. It is a design feature/flaw that cannot be completely eliminated. These steering boxes are between 35-60 years old and no new parts are available. Rebuilds get done with refurbished old parts which will still have that slop in the steering. The Borgeson is a new unit. You're starting with zero wear, zero miles.
Secondly, yeah...you can piece it together but sometimes that ends up saving you nothing. The Bergman hybrid coupler also isn't cheap but it makes this wap a bolt in job that is reversible if you decide to go back to stock or something else. No modifications to the steering column.