Some people do just that (usually we don't change the spelling, just make it consistent within the book). Some people proofread more deeply, carefully comparing with some reference printed version. Some people just take the the Project Gutenberg text, feed it to calibre/Sigil and publish the result (don't do this, this is actually against our the guidelines).
Whatever you do is fine, just specify in your book, or in the upload thread, what you have done.
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