I'd say that all the components need to be matched to the application, including the oil.
In an engine that came originally with a 20-50 oil from Ford (Boss 351) and a recommended fully grooved maim bearing, mixing a lower viscosity oil better be right on.
There still are little quirkies unique pretty much to a performance Cleveland and a Chevy knowledge basis is just a starting point.
Lower viscosity oils are a result of manufacturers needing to increase their fleet fuel averages as are hydraulic roller lifters since in the volumes they build in, every little bit helps.
However just like in translating a word from one language to another, sometimes "things get lost in translation".
I personally would be concerned with running just a 10-30 in a Cleveland. Forget about anything thinner.
If that's a conflict with the lifters, go to a different product. It's not compatible.
Getting 99 out of a 100 right isn't enough.