268 Voodoo cam rpm and vacuum

I've played with 3 different carbs so far... carter AFB , 650 DP and 750 vacuum secondary.
I'm more familiar with the Holley and have a slew of them .
I can't do any road tuning until my friend stops by on Sunday to weld the perches to the axle tubes.
just trying to get some feedback from others with a similar combo.