Most modern diesels are a bit long to try to stuff in your old truck. A international 444E is a V8 might fit. That is the same thing to what the F**D super duty used for years, not sure if they still do. As far as the brakes and stuff go, it all on how much do you want to do. You can bolt on you cab to a modern frame, or swap over to your frame. The only thing you need for an older engines is one wire with power to make it run. The newer ones need that funny looking box called a computer.
