The reserve is less than 17K. The machine shop I was dealing with said a thinker sleeve could be place in the block. As I said before I would run it with thesize sleeves that are in it since it would make a bigger displacement and would look the same externally. I was referring to the later Yenko blocks that had the Yenko nam cast into them. I was told he "worked" the original casting to make these blocks. Thanks again everyone for all the info.
Good luck to bidders,
Jason