A couple more tidbits from someone who has done many, many suspension systems...
1. My experience along with a few others have had the issues with springs too low on Darts. My guess is the lighter 108" wheelbase cars are what they were really designed for. I sell a 6 leaf 130lb spring that sits great and is US made.
2. I make my own delrin lower control arm bushings, unique to anything else on the market.
3. I like Hotchkiss sway bars, but the front requires welding of the factory style tabs. Not everyone wants to do this.
4. I also like Hellwig bars. The bracketry is a little lighter duty than Hotchkiss and less expensive. The hammertone finish is ok for some people but its there to hide roughness in the metal. The front tubular bar fits oe tabbed lower arms. High offset rims will contact the bar only at full lock.
5. I prefer QA1 upper arms for several reasons, along with firm feel torsion bars.
6. For steering, my Borgeson setup is much more modern and lighter than oe boxes. More expensive but worth it.
7. Feel free to call me at the shop or visit Bergmanautocraft.com