Mostly I have found that you need to retard the timing. Total mechanical timing. Which if I read yours correctly you are at 24 ( int and mechanical adv.) I'm running about 28. Ideal seems to be 34 to 38 to make power. I run the carb alittle rich. Lower engine temp. Not all good for making power. The other guys on here can explain what the Dynamic Compression Ratio is. But it is what you are after to keep the motor from pinging on lower quality fuels. By the way I'm running 11:1 BBC with iron heads on 91 octane fuel. Pinging is a problem from one tank of gas to the next.