I bought the Bouchilon custom radiator by Griffin with the inlet and outlet on the passenger side just as the engine is set up. It's not cheap but nothing on this swap is.
http://bouchillonperformance.com/products-radiators-gen3Buy their upper rad hose but the bottom doesn't fit, so I just bought a '70 cuda hose and trimmed it a little and it fit perfect.
Another option is the Radiator House Icebox rad. It's about the same price as Bouchilon but is darker and looks more stock. This is the radiator Graveyard Carz put in their '71 Cuda.
http://radiatorsupplyhouse.com/products/icebox-performance/One thing to note, if your hook up the fans to the mopar wire harness they will not turn on until 228ish and off at 215ish. This pretty much pegs my temp gauge. I talked with the mopar engineer that designed this harness and he said that's the normal op temp of this engine. It's too hot for me, so I'm taking my Cuda in to a local tune shop to adjust that setting via a HP Tuners software update that is now available for this PCM.