'64 Dart questions

tbr3,
Keep the pushbutton 904.. Get it rebuilt with a newer output shaft, more converter options. Get the B&M flexplate 360/904, so you don't have to balance the converter for the 360. I have this trans in my 64 Dart with a mildly built 360.
A 727 will fit with some work, hammer over the pinchweld. As for the rear the 7 1/4 might hold up a short time. If can find an 8 3/4 rear get moser big bolt axles. I would suggest changing the front 9" drums to disc brakes also...

Bob
64 Dart 2dr sdn v8