U don't need vacuum advanced hooked up period. Best way set up a duration spark is set it up on the 10L mechanical advance setting or if doesn't have it make gap. 351 bandit will be around 17-18° base 36 total. I played w one in mine till sheared the shaft from bushings not liking hi rpm. Eight way lose the vacuum an set it 36 full advance lock it down see wat it does.