I checked with the machine shop. Apparently the gaskets are a problem with the 3.0.
The best way I know to ensure you are on the right track is to run a compression test. Adjacent low cylenders indicates a head gasket issue. You may find one plug, or two plugs show signs of steam...
I am re-doing a Toyota 3.0 as well. It is my first time rebuilding a Toyota engine....however....I never reuse the head bolts. I know people who have reused headbolts in other applications....all have regretted the decision. It is my understanding that the bolts actually stretch slightly...