The Gutenberg formatting is a bit strange. So best to take simplest (Older Kindle, though text is technically simplest) and convert to epub2. Then edit epub2. Use epub2 then as source for your Kindle in azw3 format as it's a bit nicer than mobi/KF7 (Older Kindle, which will work also on newest Kindles).
If you select Convert in Calibre you'll see the options.
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