WFowler,
I've been running the variable torque clutch Gary mentioned above for the past year and a half and @45,000 miles. No problems and Gary is a super guy who is very knowledgeable about his produt and clutchs in general. I'm running the stage 2 set up. With a little change in driving habits, it drives like a stock clutch.
I use my truck for ocassional towing and daily driving. No sled pulling or drag racing.
Anthony