Never fished them on Norfork lake but up here on LO and Truman they gang up on shallow flats in the upper tributary arms, and that's when they become good flyfishing targets. The schools of whites further out on main lake points and such aren't nearly as dependable as the schools that have committed to the extreme upper ends of a lake.
By looking at the map....if I were you I'd start below Tecumseh, like maybe the shallow flats near the confluence of Lick cr.
Cover water quickly with fast strips and fly's that you can see (crease fly, big streamers, ect.) and try to get one to chase or flash on your fly, just like you do for those browns on the river, then once you have found ONE you know there will be more close by. Then start switching fly's and presentations until you figure out what they'll EAT.
They will pretty much chase, flash and swat at anything that moves quick and erratic in their vicinity and that's the best way to find them when they aren't actively busting on the surface or giving away their location in other ways. Just watch for those silver flashes behind your fly and when you see one anchor down and start actively trying to get them to bite.