Okay, main question here is what do you mean by 400 engine? Do you mean the Farmall 400's C281, or a 400-series diesel engine commonly used in 66, 86, and 88 series tractors from 1973 up?
The C281 engine may bolt up with minor modifications because I suspect that the bell housing bolt pattern is the same; a 660 is just a 560 with a revved-up engine and planetary gear reductions at the rear wheels. You'll need to drill holes in the frame rails for the front engine mounts, and figure out all the fuel, electrical, and gauge hookups.
The problem with a C281 engine is that it only turns 1800RPM, while the 660's stock engine turns 2800 RPM. Ground speed will be unbearably slow; you will probably be able to plow in road gear. I suppose you could put a pulling-modified governor on the Farmall 400 engine to get the RPMs back but don't expect to use it for work unless you like rebuilding engines.
If you're talking about a D414/D436/D466, then it's going to be a huge project. Look for a D360 out of a mid '80s school bus or municipal truck if you want to put a modern diesel in the tractor.
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Today's Featured Article - Talk of the Town: The Saga of Grandpa's Tractor - by The following saga is from the Tractor Talk Discussion Forum. Someone. The saga starts with the following message: Hey guys I have a decision to make. I know what you all will probably suggest and it will probably agree with me way down inside, but here it is. I have a picture blown up and framed in my "tractor room" of a Farmall M. It was my Grandpa's tractor, of which whom I never got to meet. He froze to death getting this tractor out of the barn to pull a truck out of the ditch before I was born. Anyway my dad and aunt had to sell it at the auction,
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