Tremec 5 speed.

I have one that I am going to use in my 69 Dart. I got the Hurst conversion kit. It comes complete and looks like it will fit nicely. The only thing that you have to do is modify the transmission tunnel with a add-on cover and cut the lower transmission cross member. What I liked about the Hurst kit is that their replacement transmission cross member (that was cut) has a upper loop to re-enforce that missing piece.