I used FO and compression got worse. I used 1/2 turn for pre-load. On zeroing, I tightened until the pushrod didn't spin.
It bothers me that my # 1 wire is on the back of the distributor. My book diagram shows it in the front. Could my wiring be scrrewed up?. It seemed to be the only way the distributor would go in with the vacuum advance pointing left (passenger side) . For the early v-8 guys, where is your #1 spark plug wire positioned on the distributor?
I am going to use the chart and see what happens. Turning 90* is more precise, but setting #2 when you're on #1? I don't understand, but will try it.