If it was my 85 Trek 560 I'd shop eBay and CL for a set of 700C Rigida wheels or any other 700C period-correct wheelset; for $150 and careful eBay shopping you could pick up a nice set of Rigidas or Mavics with Campy hubs , a six-speed freewheel, and probably some decent tires as well. Just be patient and watch your auctions, you'd be surprised at the nice vintage wheelsets that go in the $100-150 price range. Good luck and keep riding what you've got till you score the big one.