70 duster: updating, and a no-dough pro-touring makeover

Great thread and great car, Dusterbd! I used to go to school in Winston, nice little town. I've really enjoyed keeping up with your suspension/brake upgrades. I'm hoping to tear into the suspension on my 74 duster in a couple weeks with the goal of making her handle reaaaal nice. In your opinion, what one component made the biggest difference (in terms of good cornering and minimal high speed float)? Anti-sways? Body drop? Rear leafs? I appreciate your thorough documetation and will be referring back to this thread often! Props for taking the time and $$ to do it RIGHT.