In our club you must use stock block, tranny housing, and rearend.  One of the members told me that this other fellow was putting in a larger block to accomodate a larger bore and stroke.  That is why I was asking about the numbers on the block.  Steve <!-- s:) --><img src="{SMILIES_PATH}/icon_smile.gif" alt=":)" title="Smile" /><!-- s:) -->