Horse power will depend on turbo and injection pump setup.
The DT4xx share the same basic block and many components. Early blocks were 1 lifters, later truck 466s were 1.125 lifters and the really late ones were roller lifter.
Later + head is considered desirable as they are supposed to flow better.
Crankshaft stroke is different between the 3 sizes, 414, 436 and 466. 4.75, 5 and 5.35 respectively. Bore is the same at 4.3. Connecting rod is the same, piston pin height changes between the models.
I have found that the 466s out of combines and some trucks tend to have beat up rod bearings from the constant high rpm running. The 5 stroke in the 436 will take rpm better.
Ive seen 414s rebuilt as 466s, but they were restamped.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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