World Save help

[Shelldore]

So I started building Castle Brennenburg from amnesia like a year ago when technic pack was in 1.2.5 build 7.2.6, and I just barely finished the project and want to get it ready for download, however the world save doesnt work on the technic classic modpack from the new launcher and all the old launchers you download from the internet don't work anymore.  I've tried putting it into newer modpacks with the same mods, but it creates block ID problems, any ideas?

http://www.planetminecraft.com/project/castle-brennenburg--amnesia/