Who cares, just ride it!
Join Date: Jun 2006
Bikes: 1992ish Davidson Impulse, 1981 Apollo Gran Sport SS, 2006 Salsa Las Cruces, 2010 Soma Double Cross
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I don't think an early '70s UO-8 would have an English thread freewheel. I just removed a freewheel from an early '70s UE-8 (sport touring version of the UO-8) and it was a French-threaded Atom, which is very limited in terms of what you can replace it with.
If it does turn out to be English, you could source out any Suntour, Shimano or similar 5 speed to replace it with. It depends on how much range you want. For example, I had a nice 5 speed 14-34 Suntour Winner Pro on my touring bike until I upgraded to 7 speed.