^^ha leaky, nice find! Can relate to the zillion other projects but somehow feel a little luv to resurrect a junked bike. Sometimes to keep and really use the bike, others just to pass along or donate. Especially kids bikes for the needy during this time of year. Spend maybe 20 minutes on a bike, use budget tubes, pads, good second hand tires. This is a big deal for some tykes.
Your Nishiki might have a few desirable pieces on it. Retro heads, collectors like the old Blackburn racks (30 buckaroo worth...). Is the fork bent? Looks like some tour cog, good enough for the hills. Perhaps some 27" Pasella's on sale would have you riding in style. Cheer's-
BTW: Recent found this '66 Schwinn 'Racer' 3 speed on the side of road along with other bikes and junked appliances. Left them all and just took this one. Was just about to pass on it but thought 'what the heck?!' Beastly, made in Chicago with electroforged frame. Porter basket. It'll be long time before I get around to servicing it.