How does a W2 head oil the rockers/valve train?

I'd like a definitive answer to the newer W2 oiling. I'm considering buying a new set and use the valves, springs, and rockers from my older model (Vintage "79 ).
It's my understanding that the new heads do not have the oil thru holes like the older ones and push rod oiling is the only option. Is this true?
I don't have access to new ones to check out but all of the pictures I can find look like no oil thru.