Tailshaft swapping an RV 727, What output shaft is correct?

Now Vamisk, did you say you have two complete transmissions, or just one? There was mention of an adapter that was on a bell housing, but also mention of a 727 that came with the 440 engine you have.
Finding an actual 727 tail housing and output shaft shouldn't be a big deal, once the year of your transmission is figured out.