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

Thanks Max. At least the mystery is solved.

Yes Bob I have two complete stubby 727s.
One is definitely the mate to the motor so it's a '77 however the transmission fluid is scorched, curiously the motor is exceptionally low miles based on how tight the chain is and the pistons have hardly any carbon (but rust) build up.

The one I planned to use is a mystery but the fluid is clean.

Now I'm thinking I want to use the a230 lol :realcrazy: