With Blogger I republished my blog to a temp location, set the entries per page to 999 and Full entry for the Atom feed. This gave me a xml file with all the entries from my Blogger blog. I then used http://cavedoni.com/2004/02/rss1 to convert the Atom feed to an RSS 1.0 feed
Upon importing this RSS feed a few things occured.
1. I marked the import as Draft, but they all got published.
2. I selected to split the entries but they all went to the main body of the entry, I don't know if this is just a length issue, all entries are under 300 words.
Of course this could all be due to the rather complex way I had to go about to export my Blogger blog