As a spectator trying to learn from the advice given, I'm struggling to follow this thread but appreciate your commitment and effort to learn from these experts.
Maybe it would help to re-state the problem(s)? Overheating? Pinging? Timing effect on both? Cam advance effect on both? Suitability of the cam?
All of the above?
As to your timing curve, separating the mechanical from the vacuum advance curves might help others interpret the timing effect on your problem, whether it is pinging or overheating or both...
You are being advised 6 degrees at idle is low and the total advance maxing out at 2250 rpm is early. Hard for anyone to guide you on modifying it without a clear separation between mechanical and vacuum contributions to the total.
If you are unfamiliar with all this, there are good references online. Ask and I'm sure you will be pointed to good tutorials.
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