http://www.moparmusclemagazine.com/...0009_1964_plymouth_belvedere_wagon/index.html
"An 11-inch Dynamic lock-up torque converter was put in front of a modern 360 trans case, to which Doug added 47R4 V10-style diesel overdrive internals to drop the highway rpm. Understandably, this took a lot of work to modify for the wagon application, but with some trick fabricating to the crossmember and floor, plus his own adapter plate to mount the small-block case to the big block, the mission was accomplished. He even managed to retain the pushbutton selection."
Anyone interested in staying all mopar should maybe contact this guy. While his engine is not producing 800 hp, he is well over 500. He uses a simple switch to activate OD. I have seen the car in person at Gainesville Raceway and even have a pic around here somewhere with both his car and my 69 340 4speed swinger. As the article says, he's been driving it plenty...
You can skin a cat however ya like!