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RP is correct. It is much more likely the seals have failed on your vacuum pump than the tappet cover gasket needs replaced. My insulation cover is warped just as you describe yet I have no leaks.
 

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I would be sure to pin the engine and pump so everything goes back together OK. Also tripple clean the pump snout with brake cleaner when you get ready to assemble so it will not slip timing later. This link might help explain pinning the pump, etc.
TSB 18-10-94 Rev. A
 
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