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I don't either. I think the original design was supposed to be a 335 with the 4 inch bore. In other words a destroked 351. I think a .060 over 335 would be the cats meow. It would allow for more RPMs. I had a good amount of experience building, modifying & serious street racing a boss 302 which uses the same cylinder heads, I get a bit irritated when people say a Boss 302 uses 351 Cleveland heads, NO a 351 Cleveland uses Boss 302 heads. The Boss 302 came first. Anyway I turned that Boss 302 too 10,000 RPMs, I think a properly set up .060 over 335 Cleveland might be good for 9,000 with a few more cubes than a Boss 302.