oh ya if the c-shaft is broken then a whole motor would prolly be best. I'm not sure if that is a drop in or not, but if you measure carefully then you should be fine. exhaust will likely fit but the clutch may not (they are very dependent on the output shaft dimensions as well as how much spring tension it has so that it engages at the proper rpm). Unfortunately finding replacements for the bent parts will likely be a fleabay endeavor because of the age, but you may get lucky and find a few parts manufacturers that still service a few parts from it. If possible replace bent metal with tough plastic as this will lessen the likelihood of replacing them again (i know plastic seems counter intuitive but flex is better than not) . With this hobby you just have to measure as much as possible and buy from companies that have easy return policies so if something doesn't fit your just out the time and hassle rather than the money.