My towers are 5. 25" tall.
Good luck with making it all work together. Mega's opinion, is right on. There's a heck of alot more to it than building a tower and slapping on a Race Shock. More power to you if can nail it first time around, I didn't, neither did the other guys. There's really no rocket science to it, just a heck of alot of $ and elbow grease going through parts to land on the perfect mix.
As a word of caution, most of the Race Quality Shocks for our trucks are custom built. We use off the shelf 10. 5" travel Sway-a-Ways because they fit with out a hitch using our tower. There is no cutting or welding on the trucks coil bucket when with any of our Systems. I couldn't accomplish this and have 10" of usable travel do that with a KING or a FOX.
Happy to help were I can,
Sean