Vacumn advance can adjustment screw, info please.

You can figure the number out real easy, just set it loose, install it, evacuate the chamber and read the timing change. Badabing.
If you screw it in until it is really,really slow, on mine, it began to limit the amount.
You can modify the total by filing the stops. I run as much as possible because she needs the timing at cruise rpm to make the gas-mileage.
A slanty pinging? How much initial? What elevation are you at? What stall and gears?
Have you tried Trading away some initial, then bringing the mechanical in faster to compensate.
I guess you've tried the usual stuff like intake air temp,AFR, and exhaust.. And solid lifter cams are a little sensitive to the hot-lash. Mine runs pretty good at 013/023 Hot. Not so good at the spec .010/.020.......
HappyHotrodding
I'm at 6 initial. All stock slant. 3.23 gear. 12 and 22 on the valves. I'm pretty much at sea level. This all seemed to start when I swapped over to electronic. I really need to investigate the used dist. to see where everything's at, starting with the V-can. Appreciate your input.