Sounds like you can just flash dumped roms. I kinda figured it would be in parts. Maybe not. If its a full RUU or an .nbh file just flash it like any other custom rom then use the proper relocker from here
http://forum.ppcgeeks.com/showthread.php?t=42503
Alltel is CDMA right???
That should get your phone straight back to stock as if nothing was ever done.
AHHHHHH Kyle you beat me to it.. lol