I think 36-38 degrees total is about as much as is really needed in a Cleveland. The flame front burns across the Cleveland's quench chamber pretty fast and does not require the advance that other engines must have.
It is more a matter of how much and when? And when should it be reduced.
I don't believe there is a absolute right and wrong answer to this.
What is right is what works in your car for the way you drive and for the way that you like it.
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