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Wow thanks for the replies guys! This matter is much more clear now, and it makes sense that at idle and WOT the vacuum advance make no effect on it. I'll keep you guys posted on the outcome!

Nice thanks for the replies guys! Rice that sounds like a pretty good explination and good idea about checking the timing with and without vacuum advance hooked up...I think I might try to get at it this weekend to pinpoint the differences in advance :thumrigh:

Hey guys! Have a really basic noob question so this shouldn't be too hard! I have a 69 440HP, and the vacuum advance on the distributor hasn't been hooked up since we installed the engine. It runs fine, it has the purple cam so idle is a bit rough. My question is, do I need to hook this...