Well I got word back from David and 430 from MBworld and they tested the silverbox this weekend. It shifted better into drive but that is where things ended. From what they both said, it goes into limp mode in every setting so it looks like a no-go with our cars at this time. As of right now, we're limited to the valvebody upgrade that builder Bill offers. David will be putting together a valvebody come January so I will keep in touch with him and see how things progress there.