Is the exhaust in good shape? If the exhaust is rusty and has leaks, especially at the manifolds, the Y-pipe looses its ground and the oxygen sensor won't work properly. You need a scan tool to verify the oxygen sensor voltage when it acts up. If you don't have a scan tool, hook a jumper cable from the oxygen sensor to the battery ground cable and see if it acts up. Exhaust leaks before the oxygen sensor will also cause what you describe.
Outside of exhaust issues, you are probably loosing fuel pressure or volume. That engine only runs 9-13 psi of pressure, but requires a large volume of fuel to maintain power.
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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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