X pipe, Y pipe, NO pipe

Thank you. Yes I need to get some manifolds. I found a pair of magnums for a great price. I’ve read a lot of the threads on here about those manifolds. I wasn’t sure if both driver and passenger side work. I thought I remembered reading only one side works and you have to find a 340 for the other side. It’s going in a 65 Dart. Manual steering.
You don't HAVE to use a 340 DS manifold- they have similar fitment issues in early As, and cost a TON more. Interference is usually at the steering coupler- a little grinding on the manifold there, maybe a bit on the coupler itself, and a little jiggling/shimming at the motor mounts usually gets them in. Pass side is a drop-in.