With 3.55s. I would stick with 33s at first and see how they do power wise. The HBS kit is pretty simple, I ran one for a couple years before I got the 5100s. Not a lot to go wrong as long as you torque the bolts back to spec.
No problem. Here is the install I did on mine back in 2012 http://www.fordfullsize.com/threads/how-to-install-hbs-2-5-level.7983/ Let me know if you have any questions.
