As stated, it is a 70's 2WD Ford steering box. Kit came out in the early 90's and was the first power steering kit for the Bronco. Before this you had to either find stock bronco power steering parts or scab some mystery box into place (and there are a lot of mystery steering boxes on Broncos).
The conversion is good, but not what I consider great. If it works for you, leave it. As long as the steering is good there isn't anything inherently "bad" about the conversion. Just isn't what I think is the best. There are a few things I don't like (like the sector shaft a bit too long and too low for my taste, the tight fit to the radiator, etc.) but none of that is enough to take off a working power steering and put another one on.
I am guessing that when you hit a dip the steering wheel wants to turn right a little? And when pulling away from a stop hard the steering wheel wants to turn left a litttle (maybe the other way around)? If so that is a result of a non-complete installation. you have a lifted Bronco, The 2WD steering box lowers the steering pivot point (like a drop pitman arm on a normal steering box) but the track bar was not corrected accordingly. Throw in a little off geometery due to the shorter drag link and you are looking at bump steer. If it doesn't happen now then it probably will once the old school stiff suspension is removed and a nice soft spring is put in.
Bump steer is the change in steering angle as the suspension cycles. Typically the suspension cycles due to bumps, but it can also do it due to weight shift from accelerating and braking. In a typical IFS car you will get both wheels going in and out changing overall toe but in unison so it goes straight (both go in or both go out toghther). On a beam front axle the overall toe is fixed via the tie rod but the steering angle changes with bumps (both go right or both go left), thus funny steering. It is fixable and does not require replacing the steering box.
