Carburetor sizing for a blow through turbo

Houseoffubar said
Does sizing it for drivability work fine,

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.

because the turbo is forcing air through, or do you need to size it for your expected horsepower,

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

or somewhere in between?

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.