Gotta have someone that knows 6Ls very well, all the mods to do in the valvebody, and the tricks to modifying the TCC valve circuits. The rest of the voodoo magic is in the transmission tuning, which I believe he will do as well. That is the absolute key to making them last. If I had one, that's 100% where I'd take it. It likely won't be cheap, but it will be right!