You may be able to get away with that when using a composite HG, but not with an MLS. ANY warp or irregularity to the deck, any pitting or dimples and it's going to blow faster than an OEM. If your shop can't mill it so it's as smooth as glass you may use a precision lapping plate with diamond lapping paste but to must keep measuring with a precision, machinist's straight edge. I'm not kidding.
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