easy route, to get you running and driving would be to put the vacuum advance on a carb pipe that always has vacuum one below the throttle blades, rather than one above the plate that has no vacuum at idle. (which is what most 1960-late 80s cars had)
This will cause the vacuum advance to pull in some advance at idle and that advance will fall away quickly as the throttle blades open. it might work very well it may not....
Dave