Also a big fan of the Tange levin, BUT to throw some cold water on your plans, this might have the infamous 26tpi Raleigh threading. If so you will have to retain the top threaded portions of the original HS that mates with the threads of the fork. You can substitute the rest of a Levin... +1 to measuring the forkcrown (but it's probably 26.4 ISO, not 27.0 JIS).