Assuming that you did not depress the retaining collars - get the stubbs out of the holes first. Depress the collar around the top of the hole. There are little brass fingers inside the hole. If you bend them you will have to get new retainers. Then cut a piece off the straight part of the tubing going to the back of the engine, and insert it down into the manifold. Then get some rubber vacuum hose to go in between them.
