Have a 59 Apache 3100 1/2 ton 2WD 6cly 235. Truck had sat in a field for 12 years before we got it. The carb is rebuilt, new springs, ran an overhead, and all was running great for 6 months. Now we are fouling out all six spark plugs in less than a week. They are dark like its buring oil and smell rich but probably only because the fuel wasn't burning. It isn't blowing smoke unless reved high. The cylinder compression is good. New seals and the valve guides and seats are good. Even the rings have minimal wear. And for some reason the points are moving. The adjustment moves from .016 to almost 0. But as i said its new. Any suggestions could help me in a new direction. I'm out of ideas. Thanks