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Surfacing the head is usually less than .006-.008. Will not have much or any affect on setting valve lash. If there are problems with valve to head, it will be because some clown surfaced the snot out of the head to up the compression. if not the valves on most blocks are sunk deep, if so once again you have loads of clearance.Lash is the distance between lifter and but of the stem. not interference valve to head. Part 2. use a shop straight edge and check with a feeler gage. Most of this would be relatively free if the block was in the back of a Pick up at the machine shop.