I don't know what you're going to find that has sleeves... The C153 was only used in the 504's and one model of combine if I'm not mistaken, and the C153 is the only engine that will fit in a 504 gasser without major modifications.
As far as finding a replacement, you're just going to have to start finding tractor salvage yards and calling around. Unfortunately the 504 isn't terribly common compared to a C or an H, for example. You might have to drive a few hundred miles to pick one up when you find one.
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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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