Which 02 sensors did you change??
Go to the Online service manual and read the testing procedure for the code. Section EC page 195.
Clean the connectors with some contact cleaner and check for loose or bent pins.
I would get the 02 sensor problem taken care of first before you do any changing on the distributor and see if you can borrow a timing lite from someone to check timing.
I believe you have a open circuit in your sensor wiring that is causing a rich/lean mixture turning on your cel with the codes.