any dakota guru's? i have some questions

I can tell you that the electronics are going to be a PIA. It's not impossible, but not sure if it's really worth it. 1990 Dakota's were only available with 2.5L & 3.9L so a PCM would have to come from something newer.
Then there's the cost to convert to a carb engine and bypass the electronics, will the truck be worth the cost and effort.
I would search car-part.com and look for another 3.9L. The upside they're not terribly expensive, the downside, they're not V8's. They're not dogs, but if you're going to go with a 3.9L it's best to put a 5 speed behind it. An automatic will disappoint you.