Question concerning flashing ROM's

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http://androidforums.com – Okay I followed the guide here to unlock and root my phone and I succeeded, I bought and installed both ROM manager and Titanium backup, and before I go any further I have some questions. Okay, my carrier is Alltel, CDMA, and I could not find a stock ROM or RUU for it on the brick thread, only sprint, but in recovery mode I backed up my current system before installing supersu, using cwm recovery in HBOOT so I have a backup I believe of my current ROM before I even install a custom ROM, so if I was to install a custom ROM and want to revert back to me stock ROM would I be able to use that (General)