Here is what I have. My 1976 4-door Maverick seems to run and drive just fine, except that it will regularly foul the plugs. I have driven this car to Washington D.C and back, as well as Detroit Michigan and back. Not afraid to drive this car anywhere. I can normally get about 800 miles on the plugs before it will develop a slight, but noticeable miss. At this point I would remove the plugs, clean them, re-install and keep driving. It would normally take me about 2 months to put on 800 miles, since I don't drive this car everyday. Not enough to really bother me. I installed aftermarket cruise control. This requires a "pick-up" sensor to be installed on one of the spark plugs. The problem with this is, that if the spark plug has a "miss", it kicks off the cruise control. I have noticed this little "miss" happens after about 200 or 300 miles, maybe less, which means I really can't drive the car long distances without the cruise control constantly being kicked off. What good is cruise control if you really can't use it? This bothers me. I tried one of the "anti-foulers" thingys you put on the spark plug. Did not really help. Also...the car uses about a quart of oil every 600 to 800 miles or so. Doesn't puff smoke all the time, just at start up. When I bought the car, the previous owner told me the engine has been rebuilt. So....I decided to pull of the head and have it gone through. In two previous 6 cylinder Mavericks I had with the same problem, I did this and it fixed the fouling problem and fixed the oil consumption problem. So I take the head off, take it into the machine shop, and leave it to have gone through. The machine shop tells me after tearing down the head that he doesn't think the head is my problem, but also admits he is not a real mechanic either. He showed me the intake valves. Lots and lots of gunk on the back side. I wish I had a picture, but there was so much, it made me wonder how the car even ran at all. Black gunk, very hard, very crusty looking. He tells me maybe the rings did not seat when they rebuilt the motor, or that the ring gaps are all lined up, allowing oil into the combustion chamber. He said if that was the case, the tops of the pistons would look like the valves and be "wet" with oil. They don't look anything like the backs of the intake valves to me. Also, he said the umbrella valve seals were all in the "down" position...not riding the valve stems up and down. He said they would move very easily up and down the valve stem, which is why they were all "down". So, after saying all of this, look at the pictures and tell me what you think. The spark plug is after about 300 to 400 miles. They all look like this one, but this one is probably the worse. Thanks.