My ute had twin carbs on it before i got it, but i'm putting a single back on to get it going. My question is, its missing the pipe out of the passenger side of the block at the back that connects to the inlet manifold. Has anybody had to replace this, and what did they use?? tried to get one out of another engine but its solid!! anybody know its proper name (other than that pipe thingy??). I think its for backpressure etc?? thanks