Regarding the front suspension first: it only has a limited amount of travel due to the various parts it comprises. You indicate that you've cranked the torsion bars up, have cut the upper stop, and do wheel stands. My question for this end is how much distance have you left for downtravel?

For the rear suspension, this end has the most potential for travel. Once you determine what to do about sway bar connections, there is at least one option I've never read about on the forums, though some others may have at least considered this or have pondered...the use of orbital bushings in the lower control arms....?? Secondly, has anyone discussed using the Currie Anti-Rock bar to replace the OE piece?

I don't know why you'd think a solid axle would negate reliability over the IFS. Afterall, the rear is a solid axle, right? Solid axle conversion might be scary, but many have done this...think Land Raider! You might further consider your front suspension options...maybe even so far as a Ford TTB Dana 44 or 50 from Dixon Bros. or Fabtech...coil springs and long travel.

A borrowed picture: