360 magnum /42rh. What stock torque converter?

In the middle of a 360 magnum/42rh swap in a 67 Dart. Thought I was getting a 46rh, but turns out the donor had a 42rh. The 360 came out of a 1999 dodge 4wd truck. I have the torque converter and the flex plate. The transmission donor was a 1993 dodge 150 2wd. Turns out it had a 42rh. My question is, what torque converter do I use. The one that came on the 360, the one from the 318, or neither. Trying to keep cost down do prefer to use one I have if I can.