either gun is plenty and many would say too much. If you bring the Norma make sure you have enough ammo. It isn't likely you'll find any in a remote Alaskan town. The 375 is pretty easy to find ammo all over Alaska.
You might want to check these outfits. The pilot for APGS is a neighbor, and so is the owner of Nushagak Outfitters. I believe they run good operations.
Alaska Private Guide Service
299 Alvin St.; Fairbanks Ak 99712
907-457-8318 e-mail apgs@gci.net
http://www.apgs.com/salmon.htmRandy Triplett - Registered Guide #964
Phone 907-842-2710
Email rtriplett@nushagakoutfitters.com
Nushagak Outfitters P.O. Box 734 Dillingham, AK 99576
http://www.nushagakoutfitters.com/hunting.html