727 Transmission Information

I'm putting my brother-in-laws project car, 76 Duster, back together and I have two transmissions to chose from. A '79 360 with 727 that came from a car, but I know nothing else about and a '73 727 that came out of a small RV with 22k miles.

Anyone know what the stall speed might be on the RV torque convertor?

Also - Would an RV-Truck transmission have heavier duty bands or clutches than a 727 car trans?

Any help from you Mopar guys would be greatly appreciated. I might even keep the car myself.