I am sure there are folks who fished there who will enlighten you, but I wanted to mention that Joe Sowerby of the Montana Flyfishing Connection will be coming on-line with us soon. Fishing must be good because we are having a hard time connecting lately (on both sides! ;-)).
I'll ping him again and at the very least I'll send you his contact info. It might even be up on the Forum in time for your trip.