You could improve the OCR results with the following steps:
1. scan 300 dpi grayscale tiff (jpg loses too much data)
2. process scans with
ScanKromsator and upscale to 600 dpi B/W. It's hard to learn ScanKromsator but it's worth it, it's the best (and
free!) scan processing app out there. Look for a tutorial called Scan and Share. If used correctly, the results out of SK exceed all my expectations and look much better than the original.
3. OCR with FineReader
4. Save to pdf in FineReader with the text layer. Or just use the OCR text to create an epub or mobi.
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I would say ScanKromsator is the best tool I have ever dealt with for the process of creating ebooks from scans. It just processes images, splitting dual pages, autodetecting borders, adjusting page width and height, and a bunch of other basic operations that can be batch-processed and which are not usually found in any other software. The interface is quite complex and with many settings, while good documentation on program use is lacking, but anyway, it is worth the pain of learning by trial and error.
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The best scanner for these purposes is OpticBook 3600 (or even more expensive models from Plustek).