Use or don't use vacuum advance on distributor???????????????????

great article but he forgot one thing. his excuse for advanced timing is correct lean and rich greatly affect burn speed but what was never mentioned was compression. when you are at part throttle lean high vacuum conditions cylinder fill is very low compression can get as low as 50lbs and at this compression burn speed is vary slow. at wide open throttle the cylinder is hopefully filling to its high fill potential making the compression very high speeding the burn speed tremendously. all this is all in the same direction as the article but its all involved and needs to be thought of if you want to lurn and know what is going on inside your engine. another thing to think of... if your initial timing is low like 6 or 10 if your run full time vacuum and step down on the throttle your timing will drop a long way off and cause a hesitation. so if your not running a high initial timing say 20 or maybe higher you may feel a stumble. race car dont run them because 2 reasons there always wide open and dont need advance.(they would use them under yellow cause it helps keep the plugs clean helping throttle response when green comes out and saving fuel) this brings the other reason they dont use them, there illegal rule makers dont want to police them...and leaking and helping make hp on restricted engines. conclusion: if you dont run vacuum advance your missing out. run it full time vacuum but even if you use ported vacuum use it its still better then not using it