I would relace them to your old hubs so you don't have to mess with any of the cold set stuff.
Or look for wheels off of a donor bike that is set up for 5 speed in the rear.
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1971 Paramount P-13 Chrome
1973 Paramount P-15 Opaque Blue
1974 Raleigh Professional Blue Mink
1991 Waterford Paramount
Holland Titanium Dura Ace Group
Holland Titanium Ultegra Triple Group