I'm amazed, impressed and envious of all of these ultra modded cars...but here's my personal take: You literally can't put coilover suspension or rack and pinion steering on a Dart or a Valiant, etc...because it changes something fundamental that defines the car. It's no longer a Mopar Abody at that point. Rather, it's a custom car that uses the Abody as a base.
This could be good or bad depending on your definition and your priorities...but what I love about my Dart is that it drives like a Dart. I'm fine with putting higher performance components into the existing architecture but preserving the original form is important to me.
100% my opinion. I have tons of respect and admiration for those of you guys who have gone for a totally new suspension format.