It should work perfectly fine, but you might have to peak at any other init.d scripts running. I cant remember if that rom has any other dalvik mods going on. I was thinking he had a dalvik2sd inplace. If that is the case, you are going to need to delete that first (with a file manager), then boot to recovery, wipe cache/dalvik cache and flash jstntp's dalvik2dev mod.
And dont forget to create a nandroid backup prior to all of this!!