I don't know enough about cams to answer that but yes it would mean that it is bleeding off less boost out the exhaust. I agree that too many things changed to pin point why the new engine doesn't ping like the old one but I did try to make sure I had the quench as tight as possible due to the pinging of the old combo.
Now on the opposite side, a bunch of the knowledgeable N2O guys say that with a BBC on N2O you want a bigger quench like around .080 because it works better with N2O. I actually don't have a clue what the Chevelle is at because I didn't check how far in the hole the piston is. I do run a .039 head gasket though.
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