If you have some spare time, you could try PDF to HTML first, tidy up the code, and use mobipocket creator to build PRC from HTML.
For this, I mostly use PDFREFLOW found
here.
In short time, you can get familiar with using styles like I did:
Quote:
<style type="text/css">
p {text-indent: 1em; margin-top: 5;}
</style>
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Above a sample of the style a define in the HTML-HEAD.
If you define a style for normal paragraphs with margin-top, you get the "line space" inbetween. Just play around with the value suiting your needs, 5 (pixel) isn't a full line, but enough to notice and make better reading experience.
I always cross-check the HTML, check the "look" in a browser window, quick compare the layout with the PDF, insert pagebreaks between the chapters and extra lines between paragraphs like in the PDF etc.
You can do it in less than an hour, if you are not perfectionist enough to want perfect looking books.