Convert pages to posts after v3 upgrade

Hi,
I’ve recently upgrade an old setup from v1 to v3 via the ghostPro account - great automated process. However, when I import all the old json data with settings and posts it has converted over 160 posts into pages and placed them into the new pages area… and not the posts.

Is there any way to convert the pages into posts or do I have to manually adjust the raw json to strip out the page data for each post?

The previous website used to check all posts created that had the old ‘create page’ checkbox selected and a ‘work’ tag - then inserted them onto the index/main page so to keep the content fresh as the client added new posts.

Any ideas folks?!
Cheers.