360/904 question 65 Valiant

I'm in the process of swapping the 65 273/904 in my 65 Valiant for a 73 low mi. 360 that came with a 727. From what I've learned I would be better off with a 904 rather than using the 727. My question is what year 904 trans. should I be looking for to use with the 73 360? I don't want any balance issues. Thanks, Litz