Stop in for a cup of coffee

toolmanmike said

$400 ouch! My be it's from using cork gaskets and having to crank them down so tight to seal. I think the originals were rubber.

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I didn't click disagree because I'm not absolutely certain, but I do think OEM were cork gaskets. Along with china rail gaskets and others.
The trick to success with cork gaskets is use a ball peen to dimple the bolt hole upward. Tighten the bolts only enough to flatten your dimple. Seal is supposed to be from bolt to bolt, along the flat spans, not and the bolt alone.