Another thing to consider when trying to maximize your headroom for a lift is the placement of the opener. Raising the tracks for the door will give more headroom, but the typical placement of the opener will lower the headroom slightly where the opener motor is located. Replacing the opener with a jack shaft opener is one option. The other is to move your opener to a parallel track just outside the garage door opening. I did this for another reason on our other garage. Some idiot designed the garage with a big wood beam that was in the was of the opener when located in the normal location (I would be the idiot, hehe)... You can lift the door from the side by adding a z shaped piece of bent steel. This has lasted for 9 years so far with many uses per day and no failure of the door or opener. It may not be as durable for a door that does not have the reinforcing that is required for us here in the hurricane state.
BT