One more question about your block. Which casting number is it? 207, 509? Thesals brings up a good point about the .060 overbore. You can use gaskets that will hold. As for block strength, the 509 is a very good scource to use. It's 11 pounds lighter and runs 13% more nickel in the casting. Very durable for your wishes. As a two bolter it still has a wide main cap that seats very well in the block and can be easliy adapted for a splayed cap. The main webbing is thicker and reduces growth that you might experience.