68' Valiant 4 door

Pull the drain plug to the last few threads and see if water dribbles out before any oil. If so you may have a problem.If not it may just be condensation that didn't burn off yet. Slant 6 cars were notorious for this because of being so cold blooded.Even my Hemi car shows this till I run it for a long period of time. 212* is when water starts to boil and my take 220*or more to vaporize completely.Then the PCV valve will suck it into the combustion chamber and out the tail pipe.