Nice documentation. I installed the GV unit in my E-Body last March and as you document it is pretty straight forward. I had no issues with driveshaft angles just bolting the unit in place. There was some minor clearance issuses with the tunnel as you describe, but that was it. I use it 99% in auto mode and it does not alter the way the transmission works, there is just one more shift about 45 mph. I ended up using a toggle switch in the dash to control the shifts when I decide I want to instead of the floor mounted switch supplied with the kit. I am completely satisfied with it and if I had it to over again I would. I would even have used it in my 4-spd car behind the 833 instead of the Keisler unit that's in there had I converted my auto car first. I'm sure you are going to be happy with the unit.