I am trying to move an area from one world to another, a 1.6.4 modded world to a 1.7.10 modded world. Every time I move the area, it crashes. In the 1.6.4 version, I have replaced most of the modded blocks with vanilla blocks to then change back. I then went into vanilla with the world, expecting it to remove all the modded blocks, and it did. The problem is that when I go into MCEdit to copy a selection of that world over to 1.7, all the modded blocks are still there, but in vanilla minecraft they are not there. I transfered a few chunks of area over, but it crashed. Anyone know how to remove all the modded blocks from a world???