What kind of UICP do you have? the stock one is plastic so you won't be welding anything to that. If you have or going to buy a metal one, just get it with the flange for the BOV you want. Most manu will offer flanges for the most popular BOVs as an option.
Also, if you have a UICP already that has a flange for a 1G BOV which is the most popular/default flange, you can still use it for a greddy by just drilling new holes.