| There are two vac take offs - one is "full time", the other "ported", and I suspect that the second one is also "venturi effect" - i.e. vacuum related to airflow, not manifold pressure. Haven't checked properly to see tho'. You want to use the lh one as you look from the front of the car. Personally I would disconnect the vac advance totally whilst trouble shooting the carb.
You need to find out first if it is cruise or power mode that is giving you problem. I would go back to the standard step up springs if you have changed away from them.
What point on the graph in the manual are you at right now?
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