Getting ready to finish the briggs build tomorrow and i have a question . The cam i'am using is a dyno 107SS recommended timing is 32-34 degrees . The ARC flywheel says with a stock key it will be at 30 degrees . I have bought offset keys #2 #3 #4 I really don't understand them . How much will each one move my timing or which one do I need to be in the 32-34 window ? And which direction does the key install ?