904 swap 65 valiant

Soon i am going to want to pull the 904 out of my 65 valiant. The thing leaks like a siv at every possible crevice, also has trouble getting out of gear when switched to nuetral. I'd like to get a 2nd trans to either swap or rebuild first then swap. My question is is there any trans i would prefer over another, as far as years go? I know later ones have wider range of gear. I have a super mild 225 with a 2.93 rear end. Will anything else work better for a stock driver?