Talk to Smolt (Charles) he has fished the Miramichi and other rivers in the area for a long time. Just be prepared for non stop atlantic salmon stories.
Heck I even know how to properly pronounce it now.
Those old Wild Steelhead and Salmon books do have some detailed articles on atlantic salmon fishing and the Miramichi. I have one very detailed article on it. Lots of articles over the years thoughon the Miramichi system