to maintain the 1.5 degree downward engine / transmission angle, you might want to add a 12-1/2" section aft ot the transmission crossmember for the GV to reside. Some do, some don't.
an option to consider.....to engage / disengage the GV, a simple toggle on the front of the drivers side seat bracket in lieu of the supplied GV semi truck switch. This one was installed around 2010, so GV might have come up with something more hot rodder with their switch that normally mounts on the shifter.