Oil in intake ports?

What rings were used? Have you tried a compression test yet? I'd expect them to not be fully seated yet depending on the wall finish, rings used, and assembly procedures - but there should not be oil contamination. With a previous good service record but oil in all the ports and pushing out gasketed areas it makes me think it's a ring problem. Unless this is a pure-track car you need a PCV system on it too. One side has the intake breather - the other has the PCV valve to the carb and no breather.