340 valvetrain help

I talked to the guy that I bought it from and he said they put new hydraulic lifters in it. It has adjustable shaft rockers in it. So would these be set at zero lash and then 1/4 to a 1/2 turn for preload? I had the valve covers off the other day and got the feelers out and without turning the engine or anything a few of the rockers had some lash. A few of the rockers also have some side play.
Thanks in advance.
I will try and get some more photos tomorrow.