no... On a N/A l28 dizzy, the vacuum "advance" actuator "advances" timing. It does nothing to retard the timing. If you were to run a vacuum hose to the inlet of the turbo, when you got on the throttle and drew some vacuum, it would be advancing the ignition timing.
yes, "more boost will = more vacuum" but in this case, More vacuum = advanced timing.
I would do as the first line of ZFury's post says and disconnect the vacuum advance all together.
You could also run the msd 6btm which will retard timing one degree per lb. of boost.
or do as Mario said
btw... AK-Z, aren't you going to do a KA swap?