Well, if we run out of gas, we'll know who to blame: ME!
I probably should have listened to you! :-|
I am just going by what Tom has had success with. I dno't think we're going to be making any more HP than him, regardless of carb sizes. He's a tuner; we're newbies!
The difference in diameters of 10mm and 3/8ths of an inch is .0187".
I don't think that's going to be a significant amount of flow change, do you?