I'm not worried about the front springs settling with the weight and overtime. Vehicles have been using coil springs for decades and metal springs always relax over time. I'll make sure to match my pinion to the tail shaft angle. Once the truck is assembled I'll recheck it all. If its off then I can use those angles pinion tuning shims. I'll check it once and a while over the first year or 2.
I appreciate you and everyone else's input. You've all helped me feel more confident on what I am doing. And if I mess anything up I can always fix it later.
I think the motor will be going in the weekend of the 25th barring any setbacks. I've begun planning my fuel system. I'm thinking of going with the blazer tank. Anyone know if the LS fuel pumps fit right in to those late 80's blazer tanks people have been using in these ADs?