Like everyone said you can buy the plugs from ford. I was helping a friend put a new engine in his 5.0 and since we hadn't thought ahead and bought the plugs we just used a couple of his old spark plugs, worked fine. On my car I have never taken the tube off of the back of the heads. Where it bends out around the passenger side head I just stuck one of those heater core bypass caps on it where the hose to the air pump used to go. It was a perfect fit.