My old ST-14 timing card from 1965 lists the advertised duration at 266 degrees @ .017 and .485 lift. It shows real tight lash of .008" intake and .010" exhaust. Is all that the same as yours?
That's it except he says the lash on mine should be .017 int. and .019 Ex cold. He told me I could run it a little tighter if I wanted but not less than .012/.014