Need a stock Roof height for a 4x4 P/U

[Hottrucks]

since winter is coming I have been thinking about a 4x4 project and have a line on a 67.....

one small problem is my garage door is only 7 feet tall (can you see where I'm going with this) my f 350 with the cap on is a squeeze for the door...

so I need to figure out what the stock height is and then figure how much total lift ( tires/body and springs) I can put into it ...Then find the best way to get it to 6 feet 11 inches...