I am very new to farmall/international tractors. I am typically a John Deere guy. I have come across a tractor that I used to see pulling when I was a kid. Wanting to buy it and turn it back into a puller. Its been sitting in a shed for 20yrs collecting dust. Looking to build it for a 5500-7500 open turbo class. The tractor is a 560 diesel. It used to pull with a turbo in the early 90's. But the guy who owns it also has a 666 for sale. The class i am looking to pull in has 410 cubic in limit, 2.25 turbo size, and no inline pumps. The 666 price tag is alot higher than the 560. How much different is there in the chassis and transmission between the two? I am some knowledge of the 560's diesel engine. I am not sure on the engine for the 666. According to tractor data the engine is D312. How close is it to the D360 in a 766? If they are close I have plenty of parts since I work at a bus garage and still run alot of buses with the DT360. Any help would be great. I would like to get going on this project so its ready by next pulling season.