I want to know how you got the stocker to last? All it took to kill mine was a measly set of 275's :bang
The single disk South Bend units have been very good to me (on 2cnd right now) taking a lot of abuse and keeping on keeping on. I'm about to upgrade to a DD like I should have done two years ago, if you plan to make more than 500HP and abuse it that is the route I would take, with hindsight being 20/20 of course. Take a long hard look at your goals for the truck, THEN choose a clutch that will help you achieve said goals.
It's a LOT easier and cheaper to do it right the first time.