Since ive been learning more and more about how to set the timing and carb and vacuum advance i have a qestion that i cant seem to make sense in my head. Ok so lets say for example i set base timing at 12 adv and that gives me 35 total at 3000rpm. At idle that gives me 800rpm in park. Now when i hook up and adjust vacuum canister to lets say 12advanced it now shows 24 adv at idle. Fine..... Now i back off the idle screw and redo air mixture if needed and keep doing this until idle is back at 800 like i want. Im fine with that to as this is what i was told to shoot for. What i cant understand is....doesnt that mess with the initial and or total timing that was set BEFORE hooking up the vacuum pot? In other words whats the difference in using the idle/mixture screws to bring idle rpm back down to 800 vs just simply moving the distributor instead, like was done at the very first step? Is the distributor timing totally separate from the carb/vac pot even if rpm changes? I hope this makes sense.