I had a 770 SA on a 440 that pulled only about 7 inches of vacuum at 1000 RPM. Straight leg boosters and all, the fuel curve actually worked well, better than alot of other Holleys. Needed to be a little extra rich for best power at WOT (11.8ish), but the car ran decent.

Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street