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Do your math and you will see that you gained .010 didn't loose it. Using a shim will actually make things worse.
You milled .030 and used a .040 gasket. Therefore you increased the distance not decreased. By milling .030 and using a .040 you actually lost ground.
Put it together and forget the shims they will make things worse.

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and your hyd lifters will easily take up .010 with out a problem. Quite often factory tolerances were off more than that.