Don't know that you could bump the compression much with the gasket, but Felpro 1003 is a .041 tk with wire ring @ bore size 4.166, and the 1010 is a copper wire ring @.039, that the 2 most commonly used on the 406" engine with compression up too 12.5, you don't need MLS, or copper for the 9 to 1 engine unless it's turbo or supercharged.
JMO
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