2" taller shackles will net you 1" of lift, but don't go too much taller or it will get ugly when the front decides to wander.
You can go to a 29" tire with a little clearancing. Look up under the front fenders and you will see where the metal edge points at the tire. Use a mallet to bend it back so that it doesn't cut the tire during articulation. You should also watch the clearance at the firewall. You can use the same mallet to 'massage' the firewall if you have less than .5" of clearance.
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