I doubt the welder or any other non MF engine will work.
Even though the engine may have the same name and displacement, the casting and oil pan is different to accommodate the front suspension mount. There may be other differences, a possible deal killer lurking, only to be found after investing a lot of money!
Your most economical solution is to find a guaranteed good Z134 block for that tractor. There should be still quite a few out there.
If you really want to change it to a diesel, find a donor tractor. Otherwise you will be chasing your tail finding every little bracket, fitting, bolt, and wondering "what is that hole for, what goes there, what does that bracket look like???".
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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