Ok, im going to visit my folks in SouthDakota next month and my pops has a timing light and tac. I want him to advance my timing for me but I am not sure exactly how far to go before getting any knocking. I need some number here, what should I set it to. Also do you just loosen the distributer and twist it towards the front of the car to advance and to the rear of the car to retard? And if I advance the timming that will give me a little more lower end power correct?