Carburetor sizing for a blow through turbo

Yes, to error on the small side will have a higher velocity through the Venturi. This is good before boost kicks in. While under boost, the smaller carb can be power limiting.

Yes, striking the balance is about as easy as a NA engine.

Yes, the balance is where your comfortable at in having a machine drive, react while driving and it’s driving behavior at any rpm.

Details of the build would be super helpful as well as what the vehicle is intended for. How it is to be used.
Thanks! Interesting, the Holley online calculator is very conservative. I was worried that making nearly 600hp with a turbo and N/A at 300 they wanted pretty much the same carb (600cfm)
I have a 780, looks like I will be trading it for a 570-650cfm soon?!