Any valve lash advice from the gurus?

Let's say you want .020/.020 at the valve tip. Grab a .020 feeler gauge and stick it in there on a HOT relaxed valve. If the thing slips in and you can rock it, tighten the adjuster until you can feel it drag or you can spin the pushrod and tighten until you feel the slightest difference in the tension. That's all. No more. Usually when the motor is running you are moving it back and forth under the rocker arm and tightening the adjuster until you feel the same drag on the closed cycle of the valve. Remember the valve will be grabbing the feeler gauge every opening cycle so just go with it. It's pretty nerve wracking the first time when you think the socket will fall off and go down the abyss.