As a road carb, it has performed extremely well. However, if you plan on Off Road with extreme angles, Holleys have a reputation of flooding out or starving the engine. You can get a kit to prevent that and they now make the Truck Avenger which comes with the trail bells and whistles already installed. Out of the box they run just a little rich, but that is by design since they are at their best with your foot in it. The Off Roading for this truck has been as a beach vehicle. I have used it Off Road for getting to construction sites, with no problems, but that is up and down hills and through the woods on rough cut roads. None of it with the demands of a serious trail challenge where you are hanging on by your front tires or just about at the point of rolling over.
Good luck,

>-
Oh yah, the 4160 needs a kit added to hook up the kick down rod.