Chinese 4150 copy

This is one of the $300 holley knock off carbs, 850cfm every single part of it is an exact copy and I mean exact, all parts interchange with zero issues. I've ran this on several engines one bowl did leak when it was new but new gasket and that was solved. This one's going back on the new small block for my duster. I'll buy them again and again. I have no Shame in saving a buck.

View attachment 1716015641
How tuneable is it? I see the air bleeds. Does it have idle fuel restrictors? Power valve restrictors?