More distributor/advance questions

"Pink" "spark knock" "detonation" sounds like rocks pepples "in there." The sound is directly connected to engine load and throttle position, IE more load, more throttle, more ping. If you google around you should be able to find photos of "plug readings" that show signs of knock.

I doubt you can duplicate it in the garage. Worst ping is usually at low/ med RPM with a lot of load and "more throttle." It depends on compression, timing, cam timing, engine temperature, and fuel quality.

"Back in the day" when I had the 340 in the RR, I got "a little broke" before payday. I had a half tank of premium, and thought, "hell" I can put regular on top of the high test, and "take it easy" until payday. That thing pinged so bad it wasn't funny. This was a 71, high compression 340. You did NOT have trouble hearing it ping.