I am kind of confused on what you are saying. You said you have 33s now, I got that. Do you currently have a 6in lift now too? If you do have a 6in lift then going to 35s from 33s only makes your TJ 1 in taller. If you are saying you want to move to a 6in lift with 35s from a smaller lift, I am guessing you have a 4 in now with 33s. If you do have a 4 in with 33s the moves to a 6in with 35s will net you somewhere around 3-5 in taller than your current setup.
To answer your question directly, I have a TJ with a RE 5.5 in suspension lift and a 1 in body lift giving it a total of 6.5 in lift with KM2 35 in tires. I fit it in my garage with about 2-3 inches to spare and my tires are fully inflated. I am not exactly sure of the height of my garage door opening, I imagine it is the standard 7ft tall I just never measured it.