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Welcome to the forum. We have discussed this several times in the past, there are problems with the frame rails being in the way, and the alterations to make a Hemi work requires frame alteration (it's a width thing), and exhaust manifold location/dump problem. The amount of work would be very difficult, but not impossible, frustration levels would be very high, but I would love to see it done. So, until you actually do it and give us the pointers you had to do, the 360/5.9 is a good compromise. As far as the transmission goes, the 2.5/3.9 used a lighter duty 5spd, not sure about the automatic, beefiness, which would be something to look into, and remember, the 318/5.2 is internally balanced, 360/5.9 is external balanced and requires a matching torque converter/flywheel.
 

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Now why didn't anyone mention it had been done somewhere else? I guess I will have to do some investigating and see just how easy it would be. If a 5.7 Hemi will get better mileage in a Dakota than the 17mpg city driving I get now, I would be stupid not to do it, right?
 

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Does make it a whole lot easier, especially when you get to the computer controls and fabrication work you need to do to make it work.
 
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