Early shackle strap length

The car did have a rake, the long shackles were pointed straight down. The leaf springs were actually compressed in order to mount the coil spring shocks though, because the shocks weren't long enough. At any rate, looks like I'm on the hunt for leaf springs.

Edit: Can these springs be re-arched or are they toast?

They can be rearched. With or without heat. They last longer heated, but they don't last anywhere near as long as new springs and the cost to rearch will be more than new springs.