While the 4BT or 6BT would be the easiest because then you could use all factory Dodge parts which are easier to find and assemble than making something yourself it's just not as fun. The 466 would make a lot more sense to install than a 4 cyl or even a 6cyl Detroit. It's lighter than a 6-71 and has more horsepower, torque, more efficient, starts better, is more reliable, is still in production (read not obsolete) and they still make parts for it which some series Detroits parts are getting hard to find. Plus at the end of the day you won't want to dig your ears out with a spoon and have low end torque. I just don't have confidence in an engine that from the factory, Day 1, is rated to leak/burn a gallon of oil every 10 hours.
Factory ratings
6-71 238hp and 650ft-lb
466 up to 300hp and 860ft-lb
Swapping it in there would be the same amount of work if it was a 3/4 or 1ton since they have the same body, just heavier frames. To get the 466 in you will need to make some custom motor mounts, do firewall modifications to get it to sit far enough back that you can have a radiator under the hood. You may have to beef the fame in the front to handle the weight. Increase your front suspension, I'm sure the CAD Dana 44 front axle won't see the humor in the added weight, at least your unit hubs won't like it that much. Easiest way would be to find a 5 or 6 speed Allison and put in a divorce mount transfer case if you want to keep it 4x4 (which I assume you would) I have actually seen this conversion done and 8.3 C-Series Cummins engines put in pickups, it is possible.
If you want to go Mercedes I would try wilcap.com they have a lot of strange combination of adapters to make just about anything work for anything else.
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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