carb choice and slick size

i have a 650 holley df/dp awsome carbs when set it can be 50 here 1 minute and 90 the next took care of that prob with an airgap i have 750 vac seconds prob should be rebuilt if set right it only takes what it wants i am running a 750df/dp to start on new motor prob have to jump up 900 or so pm for a good price on 650 d/p 750 dp ,750 vac seconds all up to your tuner also also lott of macuni"s older was for my sleds but bikes as well or 1 funky 4-12 carb setup