What year 727 tf can I use on la360

Hey guys, I think I am going to go with a 727 as my 904 is not holding up to the 360. I am having a hard time finding a 727 or my area. I live be Eau Claire WI. What year 727 should I be looking for. My other option is I do have a 4 spd transmission and my car was originally a slant 6 with a 3spd. How hard is it to find all the parts to make my 73 duster manual again. Pedal is still in the car but that is it.
Thank you. If anyone has the parts I need to set up my car as a manual please let me know price.