Oh ok, that's a new technique to me. I will be curious to see how that pans out. I have always relied on a fly cutting machine to make them truly flat. The block in 99% of cases don't need to be decked, at least on these 4 banger lumps. Use a .002" feeler gauge all along the head surface between a straight edge and make sure it is snug all over, you should be good to go.