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Never, never, ever use any type of sealant on head gaskets. On the valve cover gaskets, it's okay, but not for the heads. You'll create more problems than you already have. What type of oil are you using and how often have you been changing it along with the filter? I have a 99 GC with 196,000 miles on it and it runs like a top. I use Castrol 10w-30 High Mileage motor oil and a Purolator Gold filter and change it every 6,000 miles. Something doesn't sound right to me. Perhaps you could try an engine flush or two along with oil changes and clear the galleries that way. The 3.3 is pretty much a bullet proof engine.