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Should there just be one large gasket or should there also be another smaller one where the threaded piece goes in that holds the.plate on?

Just the large ring gasket under the flat plate. No smaller gasket of any sort is used on either side of the threaded nipple. As noted the 2 smaller gaskets plus the ring gasket in the 3 piece kit are used in the 90 deg adapter only. Fel pro offers the large ring gasket seperately (#70078 iirc) & reportedly it is slightly thicker than the ring gasket that comes in the MP 3 piece gasket kit which is better & the single gasket would for sure be cheaper so call your parts house & see if they have one on hand. Do make sure the block circular recess & the plate are squeaky clean.

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