Lance, I would leave the RPM based curve flat in the idle area and just do a straight ramp from 1500 to 3000. Why do you want so much timing at idle? It does not do much. Factory these cars usually ran 10 or less at idle with the vacuum advance unplugged.
As far as the pinging, I would tweak one curve or the other so it gives you a little bit less timing. Your boost curve might be a little too aggressive, try pulling it a little to the left. For example set it to the full 12 degrees from 10psi to 15psi and start the ramp down a little earlier, maybe 6psi instead of 8. In other words, at 6psi it would be 0 and then ramp down to 12 degrees by 10 psi. Try that first.
There are so many variables in the way the engine is built, load, the quench, the camshaft, air density (temperature, pressure, humidity) that no one answer will work you just have to tweak it until you are happy with it. On my 440 when I put the mechanical advance MSD distributor I set it by ear and drove it. Later in the week we put a light on it and it measured 35 total. I have been running big block Mopars since the 80s, I know what they are supposed to sound like...
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