When it comes to 727s, any year newer then a 71 gets my vote. In 71 Mopar installed the part throttle kick down. Its hands up better then the older trans with the full throttle kick down.

As far as the 904 behind a 340, I beat on one pretty heavily that was installed in a 69 Charger for more then a year. Then someone wanted that Charger a whole lot more then I did, and I sent it away. Have no idea how long the 904, or the 340 lasted after it left my possession. Gene