you would need to restore your stock ROM with it being Rooted install an app called Titanium backup pro(its free). or any other application backup app.
once the apps are backed up, restore the new Rom, be sure "just to be safe"
boot into recovery and wipe dalvik cache and cache, it will ensure the old ROM aspects wont clash with the new ROM if you didn't care for app data you could restore them without data, but again that's just another way to ensure the old won't mess with the new
and yes im rambling now ha ha another way to get your apps back is to ensure google will restore them once you sign into your Gmail on the device.
it SHOULD begin installing all your old apps by default.
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