lol! I guess it's good and reassuring to see people who have actually used the math and breaker bar method with no issues. I'm a skinny guy, so...
Based on my math.. (340ft/lbs / 160lbs) x 12 = 25.5" breaker bar. I'll have to borrow my brother's extra 40lbs to get that down to a shorter bar!
I've sheared a couple torque wrenches, and have snapped off one of the "ears" of a shorter breaker bar before, so I guess I'm just leary of snapping another when dealing with that level of torque.
Warming up to the "math" approach - now to find a quality breaker bar!