Who said you can't run a turbo on a stock magnum ecm?? I am, and it runs like a raped ape. There are actually guys out there that can make it work without having to start from scratch. Sct handheld and FlyinRyan will make it happen. If you are interested I can get you his contact information.
What kind of power are you making? I'm considering a stone stock long block with flipped stock manifolds build here.. maybe upgrade a couple things along with a regasket of the motor..