With the dizzy advancing 20*, this would mean only 14* of intial timing. On the dyno, we determined that the engine made the most power with 18* initial but of course pinged when you opened it up.

I don't think rolling back to 14* is enough timing?

I am running Champion RC12YC.

EDIT: I am going to try Autolite 3923 which is one heat step down from these Champions. I am guessing with the 10.4:1 compression this might not be a bad idea.