How much do I need to pay for the UC's as a instate student with EFC of 0?

Transfer Students UC Transfers
3

You can use the Net price calculator for UC Davis and UC Berkeley both linked here to get an estimate. They are setup for Freshman applicants but you can get an idea of yearly costs as a Transfer student.

https://myawards.ucdavis.edu/AidEstimator

https://saservices.berkeley.edu/calculator/