Yeah had to replace the Air cleaner base. Cant remember if the flap on the better one was gone or just working correctly, heat riser duct is long gone though.
And yes that ducting on the passenger side is tiny, in fact when I first saw it, it never crossed my mind that it was the engine breathing trough that tiny thing.
Sometimes it is done like that I think to dewater the air, but I have not seen the rest of that ducting so I don´t know if that is the case here. The way it is supposed to work me thinks is that the small opening is meant to speed the air up and then there is usually some kind of sharpish flow direction change that the water can´t follow, instead it falls out of suspension and trickles down into some kind of drain, letting the water out.