Got it working!
I downloaded the 6.3.2 update from Amazon. I renamed it from *.bin to *.zip and stored it on the root of the SD. I booted into recovery, and tried to flash the update but it failed. I read that I had to downgrade Twrp from 2.5 which was what was installed when I rooted it to something pre-2.3. I found 2.2.2 and sided loaded it using ADB. Once I had the downgraded recovery, I wiped everything, including system, except the SD card (since that's where the update is) and flashed the 6.3.2 update. Once it completed and rebooted, I was getting repetitive force closes on android.acore. I was able to get to the system menu and did a factory reset and that cleared them up. It appears that the Kindle is back to factory fresh and the books are now on the shelf.
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