The guys over at Quadstar Tuning have been using head studs for several years now with great success. I've been following them for a few years, and have been impressed with what I've seen. They don't follow the typical hokey 6.5L aftermarket stuff (like bypass cooling mods and such), but seem to really know what they're doing.
Casey
1995 K1500 Tahoe 2 door, 6.5LTD, 4L80E, NP241, 3.42's, 285/75R16 BFG K02's; 1997 506 block; Kennedy OPS harness, gauges, Quick Heat plugs, and TD-Max chip; Dtech FSD on FSD Cooler; vacuum pump deleted, HX35 turbo, Turbo Master, 3.5" Kennedy exhaust, F code intake; dual t/stats, HO water pump, Champion radiator; Racor fuel filter