vacumm advance question

[fleetsidefive8]

I am a little bit confused by all the views. so let me come in late! If I am running a big roller cam is it better for me to use the full manifold vacumm? not the ported vacumm from the carb. But I have another question?...what do i adjust the dizzy vacumm can advance to? if my initial time is @ 8* and everybody agrees you need to have between 32-34* total advance?
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