late model 318 904 and 63 /6 904 question

Hi Folks, I have an opportunity to get a 904 tranny that was mated to a 318 from an 80s police car.
I have a 63 Dart and am considering rebuilding the tranny but to get some experience I thought I might get a tranny to practice on.
Are there any parts that I could use from the later model tranny to fit my older tranny if I were to rebuild it?
Is it worth it and are there things to look out for?

Thanks guys.
John