Name this transmission

I am just begining research on what I am going to do to my /6 Dart Wagon (I know I still need to post pictures). I know that I will put a 340 or 360 in it with a 904 or 727. I was just on craigslist and saw this add. I am sure one of you experienced builders can help me identify it or tell we what to look for if I go look at it. Also is this a decent price?
Author: admin