Crockett, thanks for the info. Those flies are what I had been planning on bringing, but it never hurts to ask before you're in the backcountry...
I'll post a report once we're back. This trip will be about the 4th time i've fished in the Park. I do a little bit better every time. The quick hook-set does take some getting used to, especially since when the hook doesn't set the fly ends up in the trees.