Migrating from 1.6.3 should be easy.
Then install Blurry based on android 2.2.1 (3.20 or 3.340) and restore your data.
- Backup your data with Titanium
- Either go back to your stock nandroid and do the OTA update (when available again) or
- check your bootloader version and SBF to get the OTA or
- do the leaked OTA 340 update and update with that or
- do the older leaked 3.20 update.zip...
Then install Blurry based on android 2.2.1 (3.20 or 3.340) and restore your data.