560, 806, 856 have the same bell housing bolt pattern. Not the exact same shape but the bolt holes will line up.
I'd still swap front covers and back plates between the two engines before installing the 301 into a 560.
The 856 would be a direct bolt in, except the frame rails will end up being about an inch short. The diesel back plate is about 1" thicker than the gas, so the frame rails are shorter to make the sheet metal fit. Save the 806 gas frame rails if you ever think you might want to do this.
Same goes if you're putting a diesel in the 806 gas. The hood will be about 1" short of fitting unless you change out the frame rails.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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