‘65 cable-shift 904 replacement advice

I’m getting ready to swap out the cable-shift 904 in my ‘65 Dart GT convertible. It’s an original 235hp car. The new tranny is one that was rebuilt by a large outfit in Phoenix and comes with a new (rebuilt) torque converter. I’ve read the FSM as much as I can, but I still have some questions, especially about releasing the shift cable, etc. The only automatics I’ve r&r’d in the past were Fords, and they were pretty easy. My FSM is a reprint, and the pages in the index don’t match with the topics, so getting the correct info is kind of a treasure hunt. Does anyone have any advice for me on where I could find a step-by-step procedure on how to do this? The cable-operated 904’s were ‘64-‘65 only according to what I’ve read, and I want to make sure I get it right. I have a lift and hydraulic transmission jack, so I won’t be doing this on the floor.

The existing transmission works ok, but leaks like a sieve just about everywhere except the dipstick tube. Also, is there anyway to see if the torque converter has a different stall speed than stock? Are they stamped or marked when modified? I bought this transmission from a guy who decided to go to a built 727 because he was going to run a high-horsepower motor.Thanks.