This is a c4, one cooling line toward the front of the tranny and one toward the rear. One goes on the right side of the radiator and one on the left. Which goes where?
I was told it doesn't matter when I did mine. The new radiator I had purchased had to have connectors installed to match the existing lines on my 71. The guy asked me if I needed new lines, I told him I didn't want to mix them up and he said the cooling cell was bi-directional. You run out a line to the side that is closest to the port on your transmission.
I don't think it matters. That bottom part of the radiator is separate from the engine cooling part, so if you go in one side and out the other, the radiator and the transmission won't know the difference. Just stab it in where it will fit, and drive the snot out of it!
if they are stock lines...they will only go one way. trying to cross them would probably cause them to kink...
I have couplings installed next to the pan years ago, makes it easy to pull. But I didnt mark which was which.