The best way would have been to remove the dizzy to replace the vac advance!
Do you have a timing light? if not you will have to borrow one from a mate.
Since you have dont most of the work already, mark the position of the dizzy (make sure you get this perfect) and slacken the dizzy locating clamp and then spin the dizzy around to get access to this screw.
then put the dizzy back where it was - and doublecheck the timing with a timing light.
goodluck.
Steve


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