putting a ford 5.0 in a 72 Dart

Welcome. I was told, the only dumb questions are the ones you don't ask. Some major fab will be needed. If you want a modern type Power Plant, consider the cost 1st. How much for coyote eng? How much for hellcat? How much for stock type 5.7? Look at the 5.2/5.9 magnums. If you get something going and go on vacation in it or like to Moparty, where can you source a needed part, if you have a breakdown. Nothing wrong with your question. Just some on here are "purists." I am putting a 5.9 magnum with the factory fi in my 71 dart. There is a section here for installing a magnum. Follow your dreams, IT IS YOUR RIDE AND IT ONLY MATTERS TO YOU. GOOD LUCK. RBKT65.