You can get block off plates that you "insert" between valve and the intake. That would be the best option. You can make one your self out of some sheet metal from the improvement store or you can buy them.
2001 ZX3 2.0L Zetec-
Hatch Nation #42
Going through Rebuild See "The TICK Build Thread" for details (http://www.focusfanatics.com/forum/showthread.php?t=289168&referrerid=62897)