Which version of advanced machines? Mine at version 1.1, or Zipps at Minecraft version 1.1? If mine it'll work, if zipps it will probably crash, just wrench them so you'll get the item, then upgrade. That will work.
Zipps. Well, I have Direwolf20's setup, so I can always NEI them back in. Will they self-delete if I uninstall advanced machines? I'm afraid I'd miss one.
EDIT: Interesting . . . I didn't crash with just a straight conversion. . .
The machines now have no real front side texture, but It's not like I could see that side to begin with, so who cares