Who's lowered more than 6" in the rear?

[Barn-core]

I've got 6" springs in the back of my '64 right now, and I've heard you can go as low as 8" with 2" blocks and a C notch before you hit the bed floor. I was just under my truck the other day though, and noticed that the drive shaft is already maybe within an inch of the top of the driveshaft loop in the trailing arm crossmember. So my question is, who has more than six inches of drop in the rear, and what mods did you have to do to get there? Thanks, Barn-core.