Unfortunately it doesnt look like anyone maintains a custom ROM for that device, at least here. You might want to start some google searches but have realistic expectations. If the device is older, it may be generally abandoned by any developers who were active. If it wasn't a popular phone when it launched, a good development scene probably never occurred so there may be little or nothing.
While development for the Ally, a older low end phone is basically dead you can still find ROM's, info, and some community support at http://androidforums.com/lg-ally/
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