After searching google for a good pic of the location I described above (LS1 & LS6):
I also stumbled across this which looks like the more traditional gm gen I location, but this is an LS3:
Here's a diagram indicating the location of the 6.0 from a G8 (L76?):
And this is off a Corvette LS3 (this is the rear of the engine driver's side) same location as the 6.0 diagram above:
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Obviously if this is top secret, a Mod should feel free to delete this posting.