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If you were running a custom Rom reflash with cwm if not flash your stock firmware with Odin.
I forgot to ask before. Do you have a nandroid backup? If you do restore it. It will be possible to flash stock with Heindall but I don't have any experience with that so I can't really help with there. I'm sure others here will be able to help though.
Since you've got cwm recovery you should be able to put a custom Rom on your external sd card and flash from there.