Those power #s are peak.Under peak,at say 2000 rpm,that 6.2 will be putting out twice the tq of that 4.0.I have put 100s of thousands of miles on 6.2/6.5 engines.And with FAR less expense than any diesel engine you can find.If after 86 vintage with the short style injector,you can slap an entire turbo setup off a 6.5 for a couple hundred bucks.The are indirect injection and run a tad warm.EGTs and no piston squiters are not a problem,you wont be able to load it enough on the trails for it to be an issue.
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