Nice Pug. I have a 70s uo-8 in the garage I haven't got to yet. I ride my Fuji regularly, with a 52/18 ss set-up. I prefer it to the 39t that was the other stock ring, but it can be tough an steep hills. I've never had to walk it though. Got used to it, i guess. That said, I do think a bigger freewheel is a good idea.
Here's my Fuji:
Fuji flip-flop single speed (After) by curlywolf, on Flickr
Here's my Fuji:
Fuji flip-flop single speed (After) by curlywolf, on Flickr
