I had done that method of setting up the valves 1once before at this point I have tried every way all my books and the internet has sujested including the old school running the engine listen for the clicking and turn down that method I found incrediblely hard the roller rockers just do not click like the old style stamped steal rockers. That motor will not pull more inches of vacuum that I can achieve. it's at the point now where it's running the best that it has but is still not acceptable. I have to have a mid range timing curve in the mechanical weights of the distributor off. Or the power valve in the carb is causing a rich senario. Or lastly I have an intermittent dead cylinder that is doing whatever it feels like it want to do.