Your pictures are so large because you're uploading them at 940 x 637 pixels. You need to resize them before you post them. Cut them down to 640 x whatever before posting.

How about using the same bushing GM used on the trailing links on the 60s - 70s GTOs, Chevelles, etc.?

I would use a 1:1 ratio. Then you're not fiddling with your shock rates.

Also, you'll have to mount your shocks upside-down, won't you?