Move Blog Entries to New System

I have 540 blog entries from a custom blog system I am migrating away from that need to be moved to a new Tumblr blog. Entry content and photos will need to be moved, and all entries will need to be backdated to the correct date/time. I don't know that there is any way to programatically import into Tumblr, so the data entry may all need to be done manually. Accuracy will be key. If you can do the import programatically in some way, will help with data in any way I can. To see the entries we are moving away from, go to [login to view URL] - IMPORTANT NOTE - blog entries from Flickr import module will not be carried over to the new system.