I did something similar. I posted the feeds from my blog to feedburner. Then I saved the RSS Feed from feedburner. It allowed me to import the contents as well as the meta tags.
I played around with the parameters start-index and max-results so that I could import 100 posts at a time
https://yourwebsite.blogspot.com/feeds/posts/default?start-index=1&max-results=100
To use, just change the website name to your blog address. Set the start index to where you want to start and the numbers of post you want to retrieve from that point.
Eg. If I want to retrieve 200 posts I would first set start-index=1 and max-results=100, after saving the the feed from feedburner I would change to start-index=101 and max-results=100
It’s troublesome but it works for me…
