Deuce,
To address your concerns about picking up the spring load at the shock mount, there are and have been quite a few roadrace C-4 Corvettes running coilovers mounted that way for quite a while. With that said, I had the same concern about wide tires (lots of traction) and big springs, so I fabricated a backing support that picked up part of the strain, and in addition, it put the rear heims on the forward four-link in a double shear situation, vice the single shear configuration that Chevy used. I saw a similar solution recently in a thread on this site. I have included a couple of pictures.
Pappy
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