For $500 bucks, that seems like an amazing and easy fixer-up project car. The bushings and clutch master cylinder are pretty easy to get (im not 100% sure though as i'm still new here and to older cars), but I wouldn't imagine that being too big of an issue. The rusted floorboard, depending on the size, could be anything from a breeze to fix to a nightmare, also depending on your skills. IMO it sounds like a good project to start on!