Download Kindle version from Gutenberg.
Convert to epub using Calibre with:
Justify (won't break headings)
Smarten punctuation
Remove space between paragraphs & put 1.4em first line indent (doesn't breake headings).
In Styles on all ebooks I convert I put line-height in Remove CSS as that should never be anywhere in any ebook.
If it's still bad open epub in Calibre editor and look CSS for body paragraphs. Beware of "inherit" in CSS.
Post link to Gutenberg page with all the formats here.
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