If I had the motor, I would probably try to straighten it, more as a challenge than a sensible job. You would DEFINITELY need to remove it from the gear case and hopefully have access to a hydraulic press and some v-blocks of hardwood or aluminum. Don’t even think about trying to straighten it, IN the gear case; as you will almost assuredly destroy the whole gear case. You will never get it factory perfect but you could probably get it to usable status. In the meantime, I would put out an ad here in the classifieds, looking for another lower unit or parts motor. It is probably a West Bend-built 18, which I think is a great motor, worth trying to save.