I'm not familiar with the book or settings for that baler... but in general terms... you start by chiseling all the rust out from under all of the guide rails and reinstalling them tightly. Then you shim the lower right rail away from the stationary knife to a certain spec.
Once that is done you start with plunger adjustments. Usually the first adjustment is the left rear which sets both the camber angle and side clearance of the plunger. This is adjusted as the knives pass and it's probably something like 30 thou... Follow the specific procedure in your book. The final adjustment is usually the wear pads on the top of the plunger that control it's vertical movement/rotation...
Given you have a 320 and the speeds it runs at... you best make sure you get everything DEAD ON ACCURATE or it'll probably go boom on you sooner than later.