I've used seafoam on all of my cars for years. Really Old cars and not-so-old cars. They've all been running fine.
I've never ran into the whole "Seafoam will clean out the gunk holding really old car engines together killed my engine"
since your car is pretty old, I suggest using seafoam in a VERY WELL VENTILATED AREA because it will produce A LOT of smoke.
If you do use seafoam, plan on changing out the spark plugs afterwards. Therefore, I've generally used seafom after every 10K miles when I change out the spark plugs anyways.
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