Minecraft Server World Upgrade?

I made a minecraft forge modded server on 1.6.4. Everything went alright until I wanted to upgrade the world to 1.7.2. I knew there will be a lot of crashes but eventually I will fix it. I got the latest forge installer and made a 1.7.2 server. Then I put the 1.6.4 world in the 1.7.2 server location and hoped it will work. Apparently the items and blocks from some mods could not be converted so I deleted all of them and hoped it will work. Fortunately, the world worked and I joined the server. When I looked around the map, all the beds and doors were gone (also the mod items disappeared but I knew that will happen). Is there any way to load the world on the 1.7.2 server with all the vanilla items loading properly?