750 Brawler vs 650 AVS 2 at the track, right OOTB !

So both carbs are vacuum secondaries? Would mechanical be the better option for better 60' times and overall ET?
I'm asking because I am thinking of replacing my Street Avenger 770 with vacuum secondaries with a Holley 850 with mechanical setup. My 60' times were slow and I'm looking to improve that.
750 is not vs