Hello All, I'm a first time user and I'd like some help. I have a 1969 F-100 with a 1975 460. I'm having an issue with setting the timing, Chiltons says the timing should be 12btc but when I turn off the engine it wants to keep on running. Advaced timing? The only change from stock is a new Edelbrock Performee intake and a summit racing 750 cfm carb, would this effect the timing degrees?