Dan, I just finished one, and there was not an addendum regarding the engine, but rather the cowl mounting, which did not apply to the newer arfs. If your cowl mounting tabs are flush to the fuse, you are good to go. They were previously recessed, and there was tapered mounting tabs to compensate for the recess. BTW I maidened mine Sunday, and she flew great! I am replacing the metal cowl mounting screws with nylon ones, as the metal wallows out the hole in the cowl. Hope this helps!