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.
any year, SMALL block 67 and up 727 will work. just get a neutral balance flexplate. If you're gonna go 4 speed route, 833s aren't too bad to find price wise will vary. You can get bellhousings easily as well.

What is the purpose of your car? if its a daily or a cruiser, you might think about going A518, which is essentially the 727 with a 4th gear OD. Just wire the OD to a switch when you want to go OD