Engine pinging? what to do??

I talked to the engine builder and basically I have to much cylinder pressure and that's why the 4 speed is causing me fits. I don't mind running some race fuel with 92 octane but if I gotta run straight race fuel I want the horsepower to go with it. We are going to go with the Indy heads and comp cams will take care of me on the cam. If we do everything right I should be able to mix the fuel and make horsepower. Doug thinks 650 to 700 HP is attainable with straight race fuel and 600 to 650 with a mix. They just didn't get the combo set up for a 4 speed car cause I had an auto and stall when they did the motor.