YES 5.9 Magnum manifolds work in early A bodies. Here is exactly how!

So I am doing this same 5.9 magnum swap into a 65 valiant with power steering. Am leaning towards using the magnum manifolds. I have a manual box ready to go and I have the steering shaft out of the manual car as well. Should I just go with the manual shaft or use the power steering shaft with previously mentioned coupler? I figured the manual shaft would be the way to go?