Holley/Demon Carb stumble

The hole tune/calibration is different top to bottom between the tw0 carbs.
I really wanted to start to do and learn how to affect my tune with air bleed and tune the top end in and all. And i have a box of air bleed for the low, and the high bleed(for the proform) but i need a data logging o2 to even start down that road.
No money for that right now........so i will just have to be happy with one of these carbs for now..........................

The air bleed on the Demon are Half the size(thread side)compared to the standard holley/proform main body.