Do AMC 727 guts work in my A-Body 727?

Not sure the tailshaft would be same splines/ length...................
I suppose that part should still be usable out of mine. I really dont know much about transmissions. When I bought mine it came with the wrong torque converter and tore up the pump and trans guy said it might not last long. That was a long time ago and not sure why he would say that instead of fixing the thing correctly but it still works but not very well. Could be a host of problems I need to address. I think I will just put that money towards a 904 I have.