Stroked motor oil levels?

As others have stated, use the standard dipstick and oil level. The diff in radius for the longer stroke is not much. Yes, ideally you would not want a "crank dipper" where the journals slap the oil. But that aspect is designed in when the engine was designed. The biggest thing to remember is the running engine has much lower oil level in the pan than a static engine. Oil drawdown in the pan at higher rpm is controlled by how well the engine drains from upstairs- which is also impacted by blowby. Crank scrapers help quite a bit but that is trying keep oil IN the pan and out of the spinning crankcase tornado going on.
Bottom line: use the standard dipstick and Full mark.