Help with Spark Plugs and electrical problems

I would replace the valve guide seals right away cause they are almost always bad on a car that old and will cause all kinds of oil usage problems including fouling plugs. You don't have to pull the head off, just the valve train and use a screw type spring compressor. Be sure to also use compressed air in the cylinders to keep the valves from falling down. It's a pretty easy job, takes about 2 hours. After that change plugs and get er to idle properly and also check out alternator output voltage at a fast idle. It should be about 14 volts.