First Auto X in the valiant.

Heres a question that one of you guys might be able to answer that I'm having no luck finding.
When lowering the car with the T/bar should you use a stiffer T/bar to make up for unloading the T/bar? I'm guessing that the T/bar system uses a preload to determine sprimg weight to original ride height?

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The torsion bar height adjustment screw has does not preload the bar and change the the spring rate. It's function is just like putting/taking away a spacer or block on a coil spring car. Just the level of the car changes. The diameter and lenght of the T-bar determine the spring rate.

You might want to run a stiffer T-bar in a lowered car so it resists bottoming out. But really for performance handling bigger springs resist body roll and front brake dive.

To run big tires/rim on a Mopar you need to run high backspace rims to utilize the room inside the wheel well. What limits you there is running into the outer tie rod and the tire hitting the inner frame rail when max turning. On a 17" you can get away with 5.0" to 5.25" if you plan well and run flat type upper ball joints and do not run dropped spindles. That gives you around 3/4" extra room inside the wheel well beyond the common 4.25" or 4.0" backspacing most people run.