I am betting it is a plug and play swap.
Let’s say it does have 3 how much custom fabricating would you have to do to the engine mounts and everything else if any? Planning on doing it to mineAre you sure the '01 Durango engine is 32 tooth? The swap happened later, in the '02 model year. It is not compatible. Your '01 Dakota would be 16 tooth. On the Dakota you have 3 connectors to the PCM - that's a JTEC controller. What does the Durango have? 3 or 4? It needs to be 3. You can also pull the cover and look at the cam sprocket on the Durango engine. If it says NGK it's the 32 tooth tone ring and not compatible. Yes, you can swap the tone rings to fit but you have to pull the crank to do it.