I am replacing my original USA model Aisan carb. The non-USA model that I bought doesn't have emission items that the USA model has. Mainly the return line next to the gas line input that returns to the EPA items under the gasoline filler pipe on the inside of the veh. Also the small 1/8 inch vent lines coming out of the outside top of the carb. It is all non-working anyway so is it alright to just leave the connections tapped off? Thanks