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2nd Gen Ram Tech1994-2001 Rams: This section is for TECHNICAL discussions only, that involve the 1994 through 2001 Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
You can, but keep in mind, the 2000 Dodge Dakota 5.2 is a fuel injected, computer controlled engine. The transmission is also computer controlled. It can be done, but you will have to work around quite a few things, as the 1973 318 is a carburetor engine.
Technically a 73 engine is the "LA" variant while a 2000 318 is the quite different "Magnum" variant. As AtomicDog wrote, it's not a drop-in replacement as you can not move the modern fuel injection etc over to that engine if that was your plan.