1973 225 valve adjustment help!please!

I warm it up to operating temp....set it at a low idle....shut it off......pull the valve cover, start it up and adjust it while it's running......010 intake and .021 exhaust. Just be carefull with the 3/8 wrench that you don't get your fingers pinched while you install or remove it from the adjuster. I find this to be the quickest and most accurate way of doing it.