Rear Lower Shock Mounts??

[72longbed]

I have this HO72 that I am rebuilding. Somebody cut the shock mounts off of the axle tube. Since now I have to decide where to locate new lower shock mounts. What is the best location for lower shock mounts on a 71/72 K20 that will be used primarily for the street with a 4" lift??

The upper frame mounts will remain in the stock location. Is it better to move the lower axle shock mounts out towards the hubs farther? Or did I read once that shocks work best in the most 'upright position'?

Thanks for your input on this,
72longbed