Randy, you've opened up a gray area. You may just try it like you want to and see what happens?

The velocity stack's one function is to keep the pressure wave of fuel that stands just outside the carb entrance from blowing down the side of the plane and have it go through the engine.

The other function -- often, the air blowing by the carb entrance creates a vacuum at the entrance of the carb. This messes up your mixture sometimes and will cause the engine to surge.

The venturi is sometimes cut at a angle. This angle is turned toward the front, but sometimes, you may find the engine may run best with the venturi in most any other angle?

There is a lot of air swirling around the area and it just depends.

Some venturi are not cut off towards the front.

There will be some different opinions here.

The bottom line is that there are a lot of variables and you may need to try several different methods before your engine runs the way you want?

You are the one that needs to be pleased?

Enjoy,

Jim