3.5 swap?

Also a dodge tech, would not touch the new 3.6, atleast not for now. making the cat and manifold all part of the head doesn't sit well. I wonder what's making those valves so hot ! Thinking about doing a '70 dart with a 3.8L setup out of a Wrangler for the wife ! Although could probably just do a 5.7 for not much more ! ..