5.7L Hemi into a 74 Duster, Front suspenion questions

I wouldn't say I don't have a clue. While I'm not educated in suspension matters, I've done a lot of research and I do know that torsion bar systems are a good design and can be made to handle, and do so very well. As you pointed out, that's why many of the "elite German" manufacturers use the design. I wanted to do something different from the beginning. Part of my need for change is packaging, and the fact that I don't have the skillset required to redesign the torsion bar system to fit the package required. I want and plan to run air. I could have chosen a more optimal geometry than the Viper for my build, but that wouldn't fit the theme of my build. As it is, I will be tweaking the Viper geometry a bit to get better handling performance for my particular build.

So to say I, and many others, "don't have a clue" is a bit unfair to say the least. While I and others may not be "educated" on all the ins/outs and pluses/minuses of torsion bar setups, I think most would agree Mopar had a great design back in the day. To each his own though...