Obviously older engines that used such oils worked very well or we wouldn't have so many older engines still around today. However, I wouldn't use them because I think they are neat to own for conversation pieces. But that is just me.
We all want the absolute best oils we can get for our engines, which is totally obvious with the question cropping up near monthly. And some times the answers get heated as well. But in reality, most any oil will make them work for a long time to come. If they are marketed and specify they meet or exceed manufacturer's specifications, I will use them with out worry. JMHO