As for parts, claims to have all parts available. I wish you much luck with your decision, We hauled them on a tri-axle goose neck trailer behind a Ford 3/4 ton truck, never had a problem with this setup. I really think it was a good tractor, Heavy, but all in all at this time, I would not recommend a Leyland unless you have a parts supplier near you.
We were able at that time to get most parts that were needed, but most people did not like to wait for the long delivery time on some parts. That makes it hard to drive very fast on a road.
About 40 Years ago, My dad sold Leyland tractors, I was impressed with the quality and power the 344 had for the size tractor it was, Here in Ohio, I would not recommend a 344 because of parts availability, after dad passed I worked with a shop that worked on the Leyland tractors for the people who owned them I helped him find parts as he needed them, the main parts he would need usually were clutch parts for tractors with Loaders but some people had no problems with the clutch. The Leyland 344 tractor steering wheel turns almost half a turn before turning the wheels.