putting a ford 5.0 in a 72 Dart

Certainly nothing is 'impossible', but it depends a great deal on your fabrication skills, as mentioned above. I am not aware of any kits or products available to simplify that particular swap, though I would not be surprised if someone had been there and done that already. If all you are looking for is a modern fuel injected powerplant, why not go with a 5.7 hemi? Lots of them around, and there is plenty of aftermarket parts and support for the swap.