Installing FBO Advance Plate ...help

When is lunch?

14° = .130” or #30 drill
16° = .149” or #25 drill
18° = .167” or #19 drill
20° = .184” or #13 drill
22° = .202” or #7 drill
24° = .225” or #1 drill
26° = .240” or B drill
28° = .260” or G drill
In my street car with bigger cam I couldn't get rid of pinging with this type of distributor. Never did adjust the timing limiter screws. But are the light advance springs a part of the problem?