Eric,
The Gryphon on the 6.0L, while not a true switch-on-the-fly device, programs really fast (about 30-35 seconds) when you want to change levels and it provides power gains similar to those on the 7.3L. The 05-07 6.0L engines are pretty reliable compared to the 03-04 and don't exhibit the head gasket problems of the earlier trucks.
Given that you're looking at a flatbed, I'd be inclined to say that you want to keep power levels reasonable... say in the 60 HP range.
Let me know if this is something you might be interested in.
__________________
Bill Cohron - The Mad Doctor  
Power Hungry Performance - The ORIGINAL in Ford performance tuning... Since 1996!
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