One thing at this point now the PCV valves only flow when the carbs are passing air. When I had an incident the mess was mostly on top of the primary carburetor. The foam S&H air filter element was oily and there was that mess all over the carburetor and its airbleeds.
Went on a four hundered mile trek. Left home Saturday morning with everything topped . Sunday morning ( in a slanted parking spot at the motel ) I checked the
oil level. The dipstick showed only gray foam. The foam was even up in the dipstick tube. I hiked down the street and bought 5 quarts of Mobil 1 20ww50 full
synthetic oil. That filled it up again. On the trip up on Saturday,water temp was what the thermostat was set for 180°. The
oil temp at the pan was running 210° to220°. Sunday comming home it was a little warmer outside and we got stuck in a virtual parade. Water temp was running 190° and oil temp was also running 190°. Spark plugs were fouled, the engine (when slowed down to idle )wanted to die at the original idle setting. Later Sunday at home and now the oil level was and is fine and all the gray oily foam is gone.