With your posted results from your compression tests and the timing you are now using without any vacuum advance I flat out can't see how you could be having pinging taking place at or near idle.
You must have something mechanical at low cycling rates making the noise you are hearing.
A good possibility to me would be that if the car uses a auto trans that your noise source is a busted flexplate .
Depending on where and how they are cracked I have heard them sound like tight rusted noises bolt being backed out to what as in your case might be sounding like ping, and many times the noise will go away by 1800 to 2200 rpm out of gear.
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs!
And he was not talking about 1/8 or 1/4 mile ETs!
1) 1940s 100% silver 4 cup tea server set.
Two dry rotted 14 x 10 Micky Thompson slicks.
1) un-mailed in gift coupon from a 1972 box of corn flakes.
Two pairs of brown leather flip flops, never seen more then 2 mph.
Education is what your left with once you forget things!
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