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31x10.50's generally fit with no rubbing at all. If you have aftermarket wheels that are wider than stock you can probably get a set of 32x11.50's on with only minor rubbing.
Bronco's are a blast, I'm sure you'll enjoy yours. I know I enjoyed mine when I had it. You will be able to find tons of information throughout this site, it's one of the best resources around. But be prepared, if you aren't carefull, it's very easy to spend tons of money on these things.
Create a gallery and post some pics of the new ride.