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I have had nothing but trouble with my small block head gaskets from day one. At some point in the near future I am going to pull the heads & have all of the "flat" surfaces checked. There has always been on thing that has made me go Hmmm & I've not thought to ask anyone if it makes a differrence on not. The water jackets above the piston, on the block, are kidney shaped. On the head it's a Round hole. The Block is a 64' & the Heads 63'. What sparked this is that I saw a block online where the hole is just the opposite & a set of heads, opposite of mine as well. Does this make a difference? I have the tools, I could theoretically bore out the holes in the head to match. Thoughts?