I typically use any of the vendors cork gaskets with silicone on both side.
Now as far as the girdle/pick up issue............I end up fabbing a new pick up EVERY time I install a girdle. The spacer sent with the RJC version puts the pick up too high in the pan for my liking. I like the pick up .375 from the bottom. The aluminum spacer moves it in a weird spot and way too high. Or.......you can buy the TA extreme pump and use an AN fitting welded to the side of the pan below the starter and run -12 hose to feed the pump, then drill out the side gallery of the block and re-tap and use -10AN to feed the engine. Real easy, right? nope, but real effective.