What took us the longest on the last engine valve gasket project. Was cleaning the gasket surfaces. It's not the easiest to get to everything with the engine in.
While the valve pans are off:
If you are around 250 to 300k is to check the valves for adjustment. It's enough time that your exhaust valves to get too tight and possibly the intake out of spec range.
As long as the valves are in that tolerance range. They are good. If you try to get them exact. It's possible, you be there for a few days .
Its just a thought while your in there.
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7 3rd gens listed in the build thread (2 are parts mobiles)
Build Thread:
https://www.toyota-4runner.org/3rd-g...os-builds.html
Brillo's Bucket Fluid Ex changer:
https://www.toyota-4runner.org/3rd-g...ml#post3358086
Sparks Plugs Wire and Coil Information:
https://www.toyota-4runner.org/3rd-g...on-5vz-fe.html