Their was one for sale a couple of weeks ago, it was hovering around $9000 for a while, I don't remember what it eventually sold for, if it sold. It would be better to do a 88ci, 90ci, or 100ci kit I don't know if the 100 will fit in the XB Chassis, I do know the others will, Do a Google, they have plenty of info, online. Buells are a wonderful motorcycle, cheap for what you get, but start modifying them and they can get expensive in a hurry. the Big Bore kits, start around $800, for a cheap set, Then you have to have the Cases Machined to allow the new cylinders to fit, but that is the easiest least expensive way to get more performance reliably.
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