I'd rebuild it and run it. At that power level you should be good to go with a decent rebuild and a shift kit. If you want to prep for a bit more power, go with the Red Eagle frictions and call it a day. I wouldn't bother to rollerize it or to do the oiling mods (one guy's humble opinion.)
Even though the 26x26 is a rarity, it doesn't matter. Run it. The convertor end is the same as the later 26x24 so the later 26 spline convertors all work.
Good luck.