Looking for some advice on a 360 magnum swap

I am currently looking at a 360 magnum out of a 95 ram 2500. It has 126k on it and is a running engine all complete with everything. First question is it better to keep the serpentine belt system? I heard better alternator but power steering setup may interfere with my battery tray. Also need to AC delete. I know ill need to change oil pan and pick up. Next question should i use stock heads or the engine quest heads that already have springs and valves in them with the LA intake bolt pattern. I already have a brand new weiand intake on my 318 LA and brand new edlebrock 1406 carb as well as brand new distributor and wires. I am new when it comes to tearing into engines but am anxious to try. I figured I would buy whatever books needed for reference. Goal is a good street machine 300-350 hp. 3.73 gears 904 trans in a 73 duster.