If your block has been decked, that means now the heads are sitting a little lower and farther out than stock on the block. By machining the intake you will undoubtedly almost double the offset of everything ie: bolt holes, port alignments and so on. Do like Bill suggests and use the afore mentioned gaskets.
I'm a retired toolmaker and I know what I'm talking about as far as machining metal to try and make fit.
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