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.
From the factory, the RV transmission might have either waffle or radial lined friction plates in it. It may even have the front drum that holds a couple of more friction plates if the RV was big block powered. The bands, with the exception of the HEMI band were all the same from 1962 to 1989. I say might have, because until you tear it down, it's impossible to say for sure.
Stall wise on the converter a lot depends on what engine the RV had. The stall could range from about 1800 to 2200 stall.
If the 79 is the factory original converter it had a decal on it, either a round one that say either LS lockup or HS lockup. If the decal isn't there look at the input shaft of the transmission.