Well I finally have gotten some work done on the go kart, after what seems like years of having it off to the side I pulled it down and started on the rear end.  I mocked some stuff up and ended up liking it.  The very corner of the triangle will have another brace going up to the rollbar to support it some more.  I had my buddy who weighs about as much as the engine stand on the skidplate and I stood about where I sit.  When we jumped together on the softest setting it almost bottomed out and when we put it on close to the hardest setting it hardly moved at all so I'd call that successful!  It also has a little bit of height adjusability which is what the washers are for, I can add of subtract 2 and raise and lower the kart a tiny bit for small adjustments.

Oh yeah, and I got an LS3.