If you know someone proficient in HTML, it is easy to convert to HTML, edit the font tags, then convert back to .mobi.
Edited to add: come to think of it, the html involved is so simple, you should be able to do it yourself.
I got that book a long time ago, during a free giveaway, and edited mine. I'm a programmer, and I'm used to HTML, but it was a simple fix.
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