Best Swap Transmission?

Good morning to all,
I am gathering parts to swap a 2012 5.7 Ram Hemi into my 1970 C-body Fury.I am here asking this question because far and away this forum has the most activity of any forum.I am asking those who have direct experience with an automatic transmission in their car.First, I am not going to put a GM or Silverstar transmission in my car, period.The 4 choices I have come up with are:
1- the 904 in the car built for 450HP with a Gear-Vendors OD unit
2- a NAG-1 5 speed from a car (police version has column shift)
3- a 46RH from a 2wd pre OBD2 truck (46RE also depending on control options)
4- my first choice...A 8hp70 2014 and up from a car
I am not afraid of the electronic transmissions as Sound German has them solved, just expensive. The 904 w/ GV is probably the easiest and cheapest with no body mods needed.
This is strictly about how well each transmission operates/drives...not fitment.The Fury is a cruiser...mostly secondary roads, very little interstate driving.
Any and all opinions from people with hands on experience is much appreciated! Thanks