Stock 1969-1976 USA dissy is vacuum retard, not advance. Post a pic of the old dissy so it can be identified.
79-87 dissy is dual vac advance.
<science fair judge> If the data above is collected by free-revving the engine, the vac advance data...
I would have to add a knock sensor circuit. I never did because I questioned if the 2F is too loud and rattles for a knock sensor. A knock sensor could back off timing a programmed amount of degrees if it senses pinging. Basically it's a 3...
When I first put Ruftoys on the road in 1986, I had to take it to a smog ref. Before failing me on the visual for not having a NOX device, he ran the obligatory baseline checks. With virtual horror, he told me I had 28 degrees of advance at idle...